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Autore: Grafiati

Pubblicato: 8 giugno 2024

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1

Peng, Xiao-Shui, Ridge Michael P. Ylagan, Yuk Ming Siu e Henry N. C. Wong. "Synthesis and Application of [3.3.0]Furofuranone in Total Synthesis". Chemistry - An Asian Journal 10, n. 10 (20 luglio 2015): 2070–83. http://dx.doi.org/10.1002/asia.201500288.

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2

Peng, Xiao-Shui, Ridge Michael P. Ylagan, Yuk Ming Siu e Henry N. C. Wong. "ChemInform Abstract: Synthesis and Application of [3.3.0]Furofuranone in Total Synthesis". ChemInform 46, n. 46 (27 ottobre 2015): no. http://dx.doi.org/10.1002/chin.201546255.

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3

Kojic, Vesna, Milos Svircev, Sanja Djokic, Ivana Kovacevic, Marko Rodic, Bojana Sreco-Zelenovic, Velimir Popsavin e Mirjana Popsavin. "Synthesis and antiproliferative activity of new thiazole hybrids with [3.3.0]furofuranone or tetrahydrofuran scaffolds". Journal of the Serbian Chemical Society, n. 00 (2023): 2. http://dx.doi.org/10.2298/jsc221130002k.

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Abstract (sommario):

New thiazole hybrids were synthesized and evaluated for their in vitro cytotoxicity against a panel of human malignant cell lines. The key steps in the synthesis of hybrids 3-7 involved the initial condensation of appropriate aldononitriles with cysteine ethyl ester hydrochloride, followed by subsequent treatment of resulting thiazolines with DBU to form the thiazole ring. Bioiso-steres 8 and 14 have been prepared after the stereoselective addition of 2-(tri-methylsilyl)thiazole to the hemiacetals obtained by periodate cleavage of terminal diol functionality in the suitably protected D-glucose derivatives. The obtained analogues showed various antiproliferative activities in the cultures of several tumour cell lines. Hybrid 6 was the most potent in HeLa cells, exhibiting more than 10 and 4 times stronger activity than both leads 1 and 2, respectively. The most active compound in Raji cells was hybrid 12, which was nearly 2-fold more potent than the clinical antitumour drug doxorubicin. All analogues were more potent in A549 cells with respect to lead 1, while compounds 6 and 7 were slightly more active than DOX. Preliminary SAR analysis revealed that the presence of a cinnamate group at the C-3 position in analogues of type 7 increases the activity of resulting molecular hybrids.

4

Ariztia, Julen, Alicia Chateau, Cédric Boura, Claude Didierjean, Sandrine Lamandé-Langle e Nadia Pellegrini Moïse. "Synthesis of anti-proliferative [3.3.0]furofuranone derivatives by lactonization and functionalization of C-glycosyl compounds". Bioorganic & Medicinal Chemistry 45 (settembre 2021): 116313. http://dx.doi.org/10.1016/j.bmc.2021.116313.

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5

Rios, María Y., Yordin D. Ocampo-Acuña, M. Ángeles Ramírez-Cisneros e María E. Salazar-Rios. "Furofuranone Lignans from Leucophyllum ambiguum". Journal of Natural Products 83, n. 5 (2 aprile 2020): 1424–31. http://dx.doi.org/10.1021/acs.jnatprod.9b00759.

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6

Swain, Nigel A., Richard C. D. Brown e Gordon Bruton. "An efficient synthesis of endo,exo-furofuranone derivatives". Chemical Communications, n. 18 (13 agosto 2002): 2042–43. http://dx.doi.org/10.1039/b206150c.

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7

Marchand, Patrice A., Norman G. Lewis e Jaroslav Zajicek. "Oxygen insertion in Sesamumindicum furanofuran lignans. Diastereoselective syntheses of enzyme substrate analogues". Canadian Journal of Chemistry 75, n. 6 (1 giugno 1997): 840–49. http://dx.doi.org/10.1139/v97-102.

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Abstract (sommario):

The furofuran lignans in sesame seed have an unusual oxygen insertion between their furan and aryl rings. In our continuing investigations on the isolation and characterization of the enzyme(s) involved, the diastereoselective syntheses of various substrate analogues for the oxygen insertion step were developed for future substrate specificity and inhibitor studies. This synthetic strategy also provided entry to so-called furofuranone epoxy-lignans, such as salicifoliol from Bupleurum sp., and acuminatolide from Helichrysum sp. Keywords: furofuran lignans, sesame, epimers, salicifoliol, acuminatolide.

8

Zhang, Wen, Lingzi Li e Chuang-Chuang Li. "Synthesis of natural products containing highly strained trans-fused bicyclo[3.3.0]octane: historical overview and future prospects". Chemical Society Reviews 50, n. 17 (2021): 9430–42. http://dx.doi.org/10.1039/d0cs01471k.

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Molecules with highly strained trans-fused bicyclo[3.3.0]octanes are very difficult to synthesize. This review provides a systematic and comprehensive discussion on the synthesis of natural products with trans-fused bicyclo[3.3.0]octanes.

9

Yates, Peter, D. Jean Burnell, Vernon J. Freer e Jeffery F. Sawyer. "Synthesis of cedranoid sesquiterpenes. III. Functionalization at carbon 4". Canadian Journal of Chemistry 65, n. 1 (1 gennaio 1987): 69–77. http://dx.doi.org/10.1139/v87-012.

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Dimethyl 6,6-dimethyl-5,7-dioxobicyclo[2.2.2]oct-2-ene-2,3-dicarboxylate (8) on irradiation in acetophenone gives dimethyl 6,6-dimethyl-4,7-dioxotricyclo[3.2.1.02,8]octane-1,8-dicarboxylate (13), which on treatment with lithium dimethylcuprate followed by monodecarbomethoxylation gives methyl 4,4-endo-8-trimethyl-3,6-dioxo-cis-bicyclo[3.3.0]octane-1-carboxylate (17). Similar irradiation of dimethyl 4,6,6-trimethyl-5,7-dioxobicyclo[2.2.2]oct-2-ene-2,3-dicarboxylate (24) and its 7,7-ethylenedioxy derivative (25) followed by treatment with DBU and concentrated H2SO4, respectively, gives dimethyl 3-hydroxy-4,4,8-trimethyl-6-oxo-cis-bicyclo[3.3.0]-octa-2,7-diene-1,2-dicarboxylate (30). This, on acetylation, reduction with NaBH4/CeCl3, methanolysis, monodecarbomethoxylation, and hydrogenation, gives methyl endo-6-hydxoxy 4,4-endo-8-trimethyl-3-oxo-cis-bicyclo[3.3.0]octane-1-carboxylate (38), while on reduction with Li/NH3 followed by monodecarbomethoxylation it gives a methyl 6-hydroxy-4,4-exo-8-trimethyl-3-oxo-cis-bicyclo[3.3.0]octane-1-carboxylate (33).

10

Yates, Peter, Rupinder S. Grewal, Peter C. Hayes e Jeffery F. Sawyer. "Synthesis of cedranoid sesquiterpenes. V. The biotols". Canadian Journal of Chemistry 66, n. 11 (1 novembre 1988): 2805–15. http://dx.doi.org/10.1139/v88-434.

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Abstract (sommario):

Reduction of dimethyl 3-hydroxy-4,4,8-trimethyl-6-oxo-cis-bicyclo[3.3.0]octa-2,7-diene-1,2-dicarboxylate (8) with lithium and ammonia gives dimethyl 3-hydroxy-4,4,exo-8-trimethyl-6-oxo-cis-bicyclo[3.3.0]oct-2-ene-1,2-dicarboxylate (9), which on acetylation, reduction with sodium borohydride, and methanolysis gives dimethyl 3,exo-6-dihydroxy-4,4,exo-8-trimethyl-cis-bicyclo[3.3.0]oct-2-ene-1,2-dicarboxylate (12). This on 2-decarbomethoxylation followed by treatment with lithium acetylide in the presence of cerium trichloride gives methyl 3-ethynyl-3,exo-6-dihydroxy-4,4,exo-8-trimethyl-cis-bicyclo[3.3.0]octane-1-carboxylate (21), which on hydration, diacetylation, and treatment with tri-n-butyltin hydride and azoisobutyronitrile is converted to methyl exo-6-acetoxy-3-acetyl-4,4,exo-8-trimethyl-cis-bicyclo[3.3.0]octane-1-carboxylate (31). Methanolysis of 31. tert-butyldimethylsilylation, and reaction with potassium tert-butoxide in tert-butyl alcohol gives exo-4-tert-butyldimethylsilyloxy-exo-2,6,6-trimethyl[5.3.11,5]undecane-8,10-dione (35). This on treatment with lithium aluminum hydride followed by oxidation and hydrogenation provides the corresponding 10-deoxo compound, 39. Reaction of this with methyllithium, dehydration, and desilylation with hydrogen fluoride in acetonitrile gives a mixture of (±)-α-biotol (1) and (±)-β-biotol (2); desilylation with hydrogen chloride in methanol gives solely (±)-1.

11

Delamere, C., C. Jakins e E. Lewars. "Tests for aromaticity applied to the pentalenoquinones A computational study". Canadian Journal of Chemistry 79, n. 10 (1 ottobre 2001): 1492–504. http://dx.doi.org/10.1139/v01-164.

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Criteria for aromaticity and antiaromaticity were applied to the four pentalenoquinones, 1,2-, 1,5-, 1,4-, and 1,6-pentalenoquinone, i.e., bicyclo[3.3.0]octa-4,6,8-triene-2,3-dione (7a), bicyclo[3.3.0]octa-3,5,8-triene-2,7-dione (7b), bicyclo[3.3.0]octa-1(5),3,7-triene-2,6-dione (7c), and bicyclo[3.3.0]octa-1(5),3,6-triene-2,8-dione (7d). Geometry optimizations and frequency calculations were done with the pBP/DN* DFT method as implemented in Spartan, and single-point HF/3-21G calculations to obtain Löwdin bond orders (Spartan), as well as HF/6-31G* NICS calculations (Gaussian 98) were also carried out. Geometries and bond orders, chemical hardness, and NICS values gave no definite indication of aromatic or antiaromatic character. However, homodesmotic ring-opening reactions to give acyclic analogues indicated that 7a and 7b are nonaromatic (resonance energies 11 and 5 kJ mol1) while 7c and 7d are antiaromatic (resonance energies 83 and 54 kJ mol1). The resonance energies were obtained with the aid of an estimate of the strain energy of the molecules 7 (86 kJ mol1) by a novel extrapolation procedure on hydropentalenes. Calculated pBP/DN* activation energies for DielsAlder reactions with ethyne and ethene placed 7a and 7b in an "unreactive" class similar to 1,3-butadiene and fulvene, and 7c and 7d in a "reactive" class, similar to cyclopentadienone.Key words: aromaticity, pentalenoquinones, DFT, hardness, NICS, homodesmotic, resonance energy, bicyclo[3.3.0]octatrienediones.

12

Guthrie, J. Peter, Roger T. Gallant e Michael C. Jennings. "Preparation and characterization of bicyclic amide acetals and monothioacetals". Canadian Journal of Chemistry 82, n. 2 (1 febbraio 2004): 268–78. http://dx.doi.org/10.1139/v03-204.

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We have prepared and characterized new examples of 5-substituted-1-aza-4,6-dioxabicyclo[3.3.0]octanes (bicyclic amide acetals) and examples of the new heterocyclic system, 5-substituted-1-aza-4-oxa-6-thiabicyclo[3.3.0]octanes (bicyclic amide monothioacetals). Detailed analysis of NMR coupling constants and X-ray structure determination for an example of each class of compound established the stereochemistry and conformation of these ring systems.Key words: bicyclic amide acetals, preparation, coupling constants, X-ray structure.

13

Riaz, Muhammad, Nisar Ullah, Arshad Mehmood, Hafiz Rab Nawaz, Abdul Malik e Nighat Afza. "Furanoid and Furofuranoid Lignans from Daphne oleoides". Zeitschrift für Naturforschung B 55, n. 12 (1 dicembre 2000): 1216–20. http://dx.doi.org/10.1515/znb-2000-1217.

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Furofuranoid lignan (1) and (2) and furanoid lignan (3) have been isolated from Daphne oleoides and their structures elucidated through chemical and spectroscopic studies as 2-(3'- methoxy-4′-O-α-D-galactopyranosylphenyl)-6-(3″-methoxy-4″-hydroxyphenyl)-3,7-dioxabicyclo[ 3.3.0]octane (1), 2-(3′,5′-dimethoxy-4′-O-a-D-galactopyranosylphenyl)-6-(3″-m ethoxy- 4″-hydroxyphenyl)-3,7-dioxabicyclo[3.3.0]octane (2), and 4,9′-dihydroxy-3,3′-dimethoxy-4′- O-β-D-glucopyranosyl-7′,9-epoxylignan (3). Two known lignans (4) and (5) have also been reported for the first time from this species.

14

Yu, Zhi-Xiang, e Cheng-Hang Liu. "Rh(I)-Catalyzed Intramolecular [3+2] Cycloaddition of trans-2-Allene-Vinylcyclopropanes". Synlett 29, n. 06 (18 gennaio 2018): 764–68. http://dx.doi.org/10.1055/s-0037-1609199.

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15

Tănase, Constantin I., Constantin Drăghici e Miron Teodor Caproiu. "New β-ketophosphonates for the synthesis of prostaglandin analogues. 2 Phosphonates with bicyclo[3.3.0]octene and bicyclo[3.3.0]octane scaffolds linked to the β-keto group". New Journal of Chemistry 44, n. 46 (2020): 20405–10. http://dx.doi.org/10.1039/d0nj04594b.

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16

Robertson, Jeremy, e Kiri Stevens. "Pyrrolizidine alkaloids". Nat. Prod. Rep. 31, n. 12 (2014): 1721–88. http://dx.doi.org/10.1039/c4np00055b.

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17

Deslongchamps, Ghislain, Daniel Mink, Paul D. Boyle e Nina Singh. "Unusual Weiss–Cook condensation of dimethyl 2,3-dioxobutanedioate and dimethyl 3-oxoglutarate". Canadian Journal of Chemistry 72, n. 4 (1 aprile 1994): 1162–64. http://dx.doi.org/10.1139/v94-148.

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Abstract (sommario):

The Weiss–Cook condensation of dimethyl 2,3-dioxobutanedioate with two equivalents of dimethyl 3-oxoglutarate in aqueous bicarbonate produces an "abnormal" product, pentamethyl cis-3-(carbomethoxymethyl)-3,7-dihydroxy-2-oxabicyclo-[3.3.0]oct-7-ene-1,4,5,6,8-pentacarboxylate 7, whose structure has been determined by X-ray crystallography. Rrapcho decarbomethoxylation (sodium chloride, aqueous dimethyl sulfoxide, 140 °C) of this compound produces dimethyl cis-3,7-dioxobi-cyclo[3.3.0]octane-1,5-dicarboxylate 4 in quantitative yield. These results suggest that compound 7 may be the product of a kinetically controlled reaction pathway involving 4-hydroxypent-2-en-1-one intermediate 5. Heating of 7 in dimethyl sulfoxide may have promoted thermodynamic equilibration to a Weiss–Cook product, which then decarbomethoxylated to produce 4.

18

Krech, Friedrich, Babett Krauss, Adolf Zschunke e Clemens Mügge. "Cis-1-phosphabicyclo[3.3.0]octan". Zeitschrift für anorganische und allgemeine Chemie 629, n. 9 (agosto 2003): 1475–76. http://dx.doi.org/10.1002/zaac.200300096.

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19

Gimazetdinov, Airat M., Aidar Z. Al’mukhametov e Mansur S. Miftakhov. "Development of a new approach for the synthesis of (+)-15-deoxy-Δ^12,14-prostaglandin J₂ methyl ester based on the [2+2]-cycloadduct of 5-trimethylsilylcyclopentadiene and dichloroketene". New Journal of Chemistry 46, n. 14 (2022): 6708–14. http://dx.doi.org/10.1039/d2nj01003h.

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20

Robertson, Jeremy, e Kiri Stevens. "Pyrrolizidine alkaloids: occurrence, biology, and chemical synthesis". Natural Product Reports 34, n. 1 (2017): 62–89. http://dx.doi.org/10.1039/c5np00076a.

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21

Antoniadis, Greg A., Michael T. M. Clements, Sriyawathie Peiris e J. B. Stothers. "13C magnetic resonance studies. 131. An examination of β-enolization in an unsaturated [3.2.1] system: 3,3-dimethylbicyclo[3.2.1]oct-6-en-2-one". Canadian Journal of Chemistry 65, n. 7 (1 luglio 1987): 1557–62. http://dx.doi.org/10.1139/v87-262.

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Abstract (sommario):

Under homoenolization conditions (t-BuO−/t-BuOH/185 °C), 3,3-dimethylbicyclo[3.2.1]oct-6-en-2-one (5) is converted into six products through three reaction pathways. The major product, 3,3-dimethylbicyclo[3.3.0]octan-2-one, arises by unidirectional β-enolate rearrangement of 5 to the isomeric unsaturated [3.3.0] ketones, which (a) undergo efficient reduction to 2, by single electron transfer, and (b) suffer Haller–Bauer cleavage to two isomeric 2,2-dimethyl-3-cyclopentenylpropanoic acids. In competition with these processes is the reversible conjugate addition of t-BuO− to 5 to furnish the 6-tert-butoxy derivative, which undergoes β-enolate rearrangement to two isomeric ketones. The structures of these products were established primarily from their 1H and 13C magnetic resonance spectra.

22

Aurich, Hans Günter, e Michael Soeberdt. "Darstellung enantiomerenreiner 3-Oxa-2,7-diazabicyclo[3.3.0]octane und ihre Umwandlung in andere bicyclische Ringsysteme/Preparation of Pure Enantiomeric 3-Oxa-2,7-diazabicyclo[3.3.0]octanes and their Conversion to Other Bicyclic Ring-Systems". Zeitschrift für Naturforschung B 54, n. 1 (1 gennaio 1999): 87–95. http://dx.doi.org/10.1515/znb-1999-0117.

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Pure Enantiomeric (S)-N-benzylalaninol (R1 = Me) and (S)-N-benzylvalinol (R1 = i-Pr) were allylated with Br-CH2-CH=CR2R3 (R2 = R3 = H; R2 = Ph, R3 = H; R2 = R3 = Ph). Swern oxidation followed by treatment with methylhydroxylamine afforded nitrones 6 (Me- N(O)=CH-CHR1-N(CH2Ph)CH2-CH=CR2R3) which underwent an intramolecular 1,3-dipolar cycloaddition providing 3-oxa-2,7-diazabicyclo[3.3.0]octanes, e.g. (1R,5R,8S)-7-benzyl-2,8- dimethyl-3-oxa-2,7-diazabicyclo[3.3.0]octane 7a (R1 = Me, R2 = R3 = H) and (1R,4R,5R,8S)- 7-benzyl-2,8-dimethyl-4-phenyl-3-oxa-2,7-diazabicyclo[3.3.0]-octane 7b (R1 = Me, R2 = Ph, R3 = H).Reductive ring opening of 7a and 7b afforded the corresponding a-hydroxyalkylated pyrrolidines (9a: R2 = H or 9b: R2 = Ph. resp.). Condensation of these compounds with benzaldehyde yielded a mixture of diastereomeric 4-oxa-2,8-diazabicyclo[4.3.0]- nonanes: 10a/11a (1R,3S,6R,9S)/(1R,3R,6R,9S) R1 = Me, R2 = R3 = H and 10b /lib (1R,3S,5R,6R,9S)/(1R,3R,5R,6R,9S) R1 = Me, R2 = Ph, R3 = H. Pyrrolidine 9b was converted to the mesylate which formed (1R,4S,5R,7S)-3-benzyl-4,6-dimethyl-7-phenyl-3,6-diazabicyclo[3.2.0]heptane 13 along with (4R,5S)-1-benzyl-3,5-dimethyl-4-styryl-imidazolidine 15 upon treatment with sodium hydroxide.

23

Brandstätter, Marco, Nikolas Huwyler e Erick M. Carreira. "Gold(i)-catalyzed stereoselective cyclization of 1,3-enyne aldehydes by a 1,3-acyloxy migration/Nazarov cyclization/aldol addition cascade". Chemical Science 10, n. 35 (2019): 8219–23. http://dx.doi.org/10.1039/c9sc02828e.

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Optically active 1,3-enyne aldehydes undergo stereoselective, Au-catalyzed conversion to bicyclo[3.3.0]octenones (up to 97% ee, good d.r.) via a domino sequence involving 1,3-acyloxy migration, Nazarov cyclization and an unprecedented aldol addition.

24

Bhat, Bilal A., Showkat Rashid e Goverdhan Mehta. "Progress in the Total Synthesis of Natural Products Embodying Diverse Furofuranone Motifs: A New Millennium Update". Asian Journal of Organic Chemistry 9, n. 11 (13 ottobre 2020): 1726–53. http://dx.doi.org/10.1002/ajoc.202000401.

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25

Flippen-Anderson, Judith L., Jeffrey R. Deschamps, Clifford George e Richard D. Gilardi. "4,4,8,8-Tetranitro-2,6-dioxabicyclo[3.3.0]octane". Acta Crystallographica Section E Structure Reports Online 58, n. 9 (23 agosto 2002): o1018—o1020. http://dx.doi.org/10.1107/s1600536802014101.

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26

Baumeister, U., H. Hartung e F. Krech. "1-Phosphabicyclo[3.3.0]octane 1-sulfide". Acta Crystallographica Section C Crystal Structure Communications 46, n. 4 (15 aprile 1990): 634–37. http://dx.doi.org/10.1107/s0108270189008085.

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27

Eberle, Marcel K., Reinhart Keese e Helen Stoeckli-Evans. "A bicyclo[3.3.0]octan-2-ylcyclopentanone". Acta Crystallographica Section E Structure Reports Online 57, n. 5 (30 aprile 2001): o461—o462. http://dx.doi.org/10.1107/s1600536801006808.

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28

Ma, Chenxi, e Anthony F. Hill. "Methimazolyl based diptych bicyclo-[3.3.0]-ruthenaboratranes". Dalton Transactions 48, n. 6 (2019): 1976–92. http://dx.doi.org/10.1039/c8dt04813d.

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Abstract (sommario):

The reactions of [RuCl(R)(CO)(PPh₃)₂] (R = CHCHPh, Ph) with Na[H₂B(mt)₂] (mt = N-methyl-2-mercaptoimidazolyl) transiently provide [Ru(R)(CO)(PPh₃){κ³-H,S,S′-H₂B(mt)₂}] which each evolve to the ruthenaboratrane [Ru(CO)(PPh₃)₂{κ³-B,S,S′-BH(mt)₂}](Ru→B)⁸.

29

Xiang, Yuejun, Raymond F. Schinazi e Kang Zhao. "Synthesis of [3.3.0] bicyclic isoxazolidinyl nucleosides". Bioorganic & Medicinal Chemistry Letters 6, n. 13 (luglio 1996): 1475–78. http://dx.doi.org/10.1016/s0960-894x(96)00262-4.

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30

Vega, Andrés, Oscar Donoso-Tauda, Andres Ibañez e Carlos A. Escobar. "Five bicyclo[3.3.0]octa-2,6-dienes". Acta Crystallographica Section C Crystal Structure Communications 64, n. 4 (8 marzo 2008): o199—o204. http://dx.doi.org/10.1107/s0108270108004290.

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31

Knotnerus, J., e H. Schilling. "Bicyclanes: V. New syntheses of cis-bicyclo[3.3.0]octane and cis-bicyclo[3.3.0]oct-2-ene". Recueil des Travaux Chimiques des Pays-Bas 83, n. 11 (2 settembre 2010): 1185–90. http://dx.doi.org/10.1002/recl.19640831110.

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32

Muhit, Md Abdul, Kaoru Umehara e Hiroshi Noguchi. "Five furofuranone lignan glucosides from Terminalia citrina inhibit in vitro E 2 -enhanced breast cancer cell proliferation". Fitoterapia 113 (settembre 2016): 74–79. http://dx.doi.org/10.1016/j.fitote.2016.07.004.

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33

Gund, Machhindra, Martin Déry e Claude Spino. "Synthesis of carotol using a formal (4+1)-cycloaddition of chiral dialkoxycarbenes". Canadian Journal of Chemistry 96, n. 3 (marzo 2018): 311–27. http://dx.doi.org/10.1139/cjc-2017-0594.

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Abstract (sommario):

We report formal intramolecular (4+1)-cycloadditions of dialkoxycarbenes used in the synthesis of the daucane-type sesquiterpene carotol. We found a chiral dialkoxycarbene capable of diastereoselective formation of a key oxabicyclo[3.3.0]octene adduct. Carotol was synthesized in 14 linear steps from simple starting materials.

34

Grygorenko, Oleksandr, Yevhenii Sokolenko, Eugeniy Ostapchuk e Artem Artemenko. "An Approach to 3-Oxa-7-azabicyclo[3.3.0]octanes – Bicyclic Morpholine Surrogates". Synthesis 49, n. 14 (13 aprile 2017): 3112–17. http://dx.doi.org/10.1055/s-0036-1588785.

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Abstract (sommario):

An approach to 3-oxa-7-azabicyclo[3.3.0]octanes, bicyclic morpholine analogues, is reported, which relies on [3+2] cycloaddition of maleic anhydrides or furan-2(5H)-ones and an in situ generated azomethine ylide. The utility of the method was demonstrated on a multigram scale.

35

Tanase, Constantin I., Anamaria Hanganu e Constantin Draghici. "Trifluoroacetylation of Alcohols During NMR Study of Compounds with Bicyclo[2.2.1]heptane, Oxabicyclo[3.3.0]octane and Bicyclo[3.3.0]octane Skeleton". Revista de Chimie 72, n. 2 (7 maggio 2021): 156–77. http://dx.doi.org/10.37358/rc.21.2.8428.

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TFA was added to a solution of a bicyclo[2.2.1]heptane azide-alcohol in CDCl3 to correctly characterize the compound, but during 24 h gave the trifluoro acetylated compound in quantitative yield. NMR spectra of the esterified compound helped us also to correctly attribute the NMR signals to the protons, and also confirmed the identification of the carbon atoms. The study was extended to other 14 compounds containing a primary alcohol group alone or with an ethylene ketal, a δ- or -lactone group, a primary and a secondary group, two primary and an alkene group and two primary and a secondary alcohol groups on scaffolds containing bicyclo[2.2.1]heptane, oxabicyclo[3.3.0]octane, bicyclo [2.2.1]heptane constrained with a cyclopropane ring and bicyclo[3.3.0]octane fragments. The esterification of all compounds was also quantitative in 24 to 72 h; this helped us to correct attribute the NMR signals to the protons and carbon atoms of the un-esterified compounds by comparison with those of the trifluoro acetylated compounds. A graphical presentation of 1H- and 13C-NMR spectra of a few un-esterified and esterified compounds are presented in the paper.

36

Quast, Helmut, Jürgen Carlsen, Thomas Herkert, Rolf Janiak, Horst Röschert, Eva-Maria Peters, Karl Peters e Hans Georg von Schnering. "Stereochemie der Addition von Phenylmetall-Reagenzien an Bicyclo[3.3.0]octandione und -octadiendione. — Synthese phenylsubstituierter Bicyclo[3.3.0]octadiene". Liebigs Annalen der Chemie 1992, n. 5 (19 maggio 1992): 495–511. http://dx.doi.org/10.1002/jlac.199219920188.

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37

Becheanu, Armand, Thomas Bell, Sabine Laschat, Angelika Baro, Wolfgang Frey, Nelli Steinke e Peter Fischer. "Synthesis of Pentalene Systems Employing a Sequence of Pauson-Khand Reaction, Michael Reaction, and Desilylation". Zeitschrift für Naturforschung B 61, n. 5 (1 maggio 2006): 589–96. http://dx.doi.org/10.1515/znb-2006-0514.

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Abstract (sommario):

The utility of cyclopentadiene (4) in intermolecular Pauson-Khand reactions was investigated. Subsequently, a 1,4-addition of lithium organocuprates was carried out followed by desilylation. This synthetic concept allows the preparation of β -functionalized bicyclo[3.3.0]octane derivatives 1a - c in only three steps in total yields up to 53%.

38

Kliegel, Wolfgang, Gottfried Lubkowitz, Steven J. Rettig e James Trotter. "Structural studies of organoboron compounds. LIII. N,N-Diethylhydroxylamine-(O-B)1,7-dimethyl-3,5-diphenyl-2,4,6-trioxa-7-aza-1-azonia-3-bora-5- boratabicyclo[3.3.0]octane". Canadian Journal of Chemistry 70, n. 7 (1 luglio 1992): 2022–26. http://dx.doi.org/10.1139/v92-254.

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Abstract (sommario):

Reaction of the condensation product of N,N′-dimethyl-N,N′-dihydroxymethanediamine and phenylboronic acid with N,N-diethylhydroxylamine gives N,N-diethylhydroxylamine(O-B)1,7-dimethyl-3,5-diphenyl-2,4,6-trioxa-7-aza-1-azonia-3-bora-5-boratabicyclo[3.3.0]octane [3-(2-ethyl-1-oxa-2-azoniabutyl)-1,7-dimethyl-3,5-diphenyl-2,4,6-trioxa-7-aza-1-azonia-3,5-diboratabicyclo[3.3.0]octane, 3] in high yield. Crystals of 3 are orthorhombic, a = 11.8132(11), b = 15.4768(11), c = 11.7325(16) Å, Z = 4, space group P212121. The structure was solved by direct methods and was refined by full-matrix least-squares procedures to R = 0.039 and Rw = 0.044 for 1729 reflections with I ≥ 2σ(I). The title compound is the second example of this recently characterized class of O-B coordinated hydroxylamine complexes, stabilized by an intramolecular [Formula: see text] hydrogen bond [Formula: see text]. Bond lengths about boron are: B—O(N) = 1.482(4)–1.526(4), B—O(B) = 1.412(4) and 1.420(4), B—N = 1.712(4), B—C = 1.591(5) and 1.602(5) Å.

39

Bird, C. W., E. C. J. Coffee e B. W. C. Schmidl. "Bicyclo [3.3.0]Octane Derivatives for Carbaprostacyclin Synthesis". Synthetic Communications 23, n. 5 (1 marzo 1993): 613–20. http://dx.doi.org/10.1080/00397919308009819.

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40

Lachaise, I., K. Nohair, M. Hakiki e J. Y. Nédélec. "A Straightforward Synthesis of [3.3.0]Bicyclic Compounds". Synthetic Communications 25, n. 22 (novembre 1995): 3529–36. http://dx.doi.org/10.1080/00397919508015487.

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41

Archibald, T. G., e K. Baum. "Synthesis of Polynitro-2,6-dioxabicyclo[3.3.0]octanes". Synthetic Communications 19, n. 9-10 (giugno 1989): 1493–98. http://dx.doi.org/10.1080/00397918908051042.

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42

Tanaka, Koichi, Tomoyuki Watanabe e Masako Kato. "Guest-Dependent Organic Photochromism of 7-Bromo-1,4,8-Triphenyl-2,3-Benzo[3.3.0]Octa-2,4,7-Trien-6-One in the Solid State". Journal of Chemical Research 2003, n. 9 (settembre 2003): 535–37. http://dx.doi.org/10.3184/030823403322597207.

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Abstract (sommario):

Inclusion crystals of 7-bromo-1,4,8-triphenyl-2,3-benzo[3.3.0]octa-2,4,7-trien-6-one (1a) and its chloro-derivative (1b) showed a reversible colour change from yellow to green on exposure to UV-light, and this depends on the guest molecules present. The crystal structures of the inclusion complex were determined by X-ray analysis.

43

Bartmann, Wilhelm, Gerhard Beck, Wolfram Fehlhaber e Jiří Protiva. "Synthese von (8RS,9SR,11RS,13E,15R)-(±)-1,2,3,4-tetranor-9,11,15-trihydroxy-16,16-dimethyl-18-oxa-13-prostensäure". Collection of Czechoslovak Chemical Communications 54, n. 1 (1989): 189–95. http://dx.doi.org/10.1135/cccc19890189.

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Abstract (sommario):

Ausgehend von (1SR,5RS,6RS,7RS)-(±)-6-((1E)-4,4-Dimethyl-3-oxo-6-oxa-1-octenyl)-7-hydroxy-2-oxabicyclo[3.3.0]octan-3-on (II) wird in einer siebenstufigen Synthese (8RS,9SR,11RS,13E,15R)-(±)-1,2,3,4-Tetranor-9,11,15-trihydroxy-16,16-dimethyl-18-oxa-13-prostensäure (XII) dargestellt. Die Saure XII ist ein urinärer Hauptmetabolit des PGE2-Analog Dimoxaprost (I).

44

Stachel, Hans-Dietrich, Želmíra Odlerová e Karel Waisser. "A New Pharmacophore of Potential Antimycobacterial Activity: The Disulfide Group in the Ring of Alicyclic Compounds". Collection of Czechoslovak Chemical Communications 62, n. 3 (1997): 510–15. http://dx.doi.org/10.1135/cccc19970510.

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A series of thirty 2,3-dithiabicyclo[3.3.0]octa-4,8-diene derivatives was examined for antimycobacterial activity against Mycobacterium tuberculosis, M. kansasii, M. avium, and M. fortuitum. The structure-activity relationships were analysed by Free-Wilson method. The authors consider the disulfide moiety to be the pharmacophore of antimycobacterial activity. To verify the idea, several other monocyclic sulfides, 3,4-dihydro-1,2-dithiolane derivatives, were also evaluated.

45

Butcher, Ray J., Robin Evans e R. Gilardi. "2,4,6-Trinitro-2,4,6,8-tetraazabicyclo[3.3.0]octan-7-one". Acta Crystallographica Section E Structure Reports Online 60, n. 9 (21 agosto 2004): o1543—o1545. http://dx.doi.org/10.1107/s160053680401880x.

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46

Cronan Jnr, J. M., F. R. Fronczek e M. L. McLaughlin. "A bichromophoric difulvene from 3,7-bicyclo[3.3.0]octadione". Acta Crystallographica Section C Crystal Structure Communications 46, n. 6 (15 giugno 1990): 1176–78. http://dx.doi.org/10.1107/s0108270190001445.

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47

Zharkikh, L. N., G. F. Muzychenko, V. G. Kul'nevich, V. E. Zavodnik, K. S. Pushkareva, G. V. Golovko e A. V. Ignatenko. "Reduction of 2-oxa-3,7-diazabicyclo[3.3.0]octanes". Chemistry of Heterocyclic Compounds 28, n. 7 (luglio 1992): 738–41. http://dx.doi.org/10.1007/bf00474484.

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48

Hodgson, David M., e Iain D. Cameron. "Functionalized Bicyclo[3.3.0]octanes by Enantioselective Transannular Desymmetrization". Organic Letters 3, n. 3 (febbraio 2001): 441–44. http://dx.doi.org/10.1021/ol006947n.

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49

XIANG, Y., R. F. SCHINAZI e K. ZHAO. "ChemInform Abstract: Synthesis of (3.3.0) Bicyclic Isoxazolidinyl Nucleosides." ChemInform 27, n. 47 (4 agosto 2010): no. http://dx.doi.org/10.1002/chin.199647233.

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50

Lee, Jae Wook, Ho Jung Son, Yeon Eui Jung e Jae Ho Lee. "Synthesis of 2,7-Diazabicyclo[3.3.0]octane and 2,7-Diazabicyclo[3.3.0]oct-4-ene Derivatives via Cyclization Reaction and Julia Reaction". Synthetic Communications 26, n. 8 (aprile 1996): 1499–505. http://dx.doi.org/10.1080/00397919608003516.

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