Journal articles: 'Isochromanes'

1

Dyachenko, V. I., and V. V. Semenov. "A new approach to isochromanes." Russian Chemical Bulletin 59, no. 4 (April 2010): 870–71. http://dx.doi.org/10.1007/s11172-010-0178-0.

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2

Saikia, Anil K., Sabera Sultana, Ngangbam Renubala Devi, Manash J. Deka, Kartikeya Tiwari, and Vikash K. Dubey. "Diastereoselective synthesis of substituted hexahydrobenzo[de]isochromanes and evaluation of their antileishmanial activity." Organic & Biomolecular Chemistry 14, no. 3 (2016): 970–79. http://dx.doi.org/10.1039/c5ob02038g.

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3

Dyachenko, V. I., and V. V. Semenov. "ChemInform Abstract: A New Approach to Isochromanes." ChemInform 42, no. 11 (February 17, 2011): no. http://dx.doi.org/10.1002/chin.201111160.

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4

Kuramochi, Kouji, Kazunori Tsubaki, Isoko Kuriyama, Yoshiyuki Mizushina, Hiromi Yoshida, Toshifumi Takeuchi, Shinji Kamisuki, Fumio Sugawara, and Susumu Kobayashi. "Synthesis, Structure, and Cytotoxicity Studies of Some Fungal Isochromanes." Journal of Natural Products 76, no. 9 (September 13, 2013): 1737–45. http://dx.doi.org/10.1021/np400460m.

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5

Pihlaja, K., J. Mattinen, E. Kleinpeter, R. Meusinger, Ch Duscheck, and R. Borsdorf. "A1H and13C NMR conformational study of methyl-substituted isochromanes." Magnetic Resonance in Chemistry 23, no. 9 (September 1985): 754–58. http://dx.doi.org/10.1002/mrc.1260230915.

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6

Li, Xiao-Hua, Xue-Hua Han, Ling-Ling Qin, Jun-Lin He, Zhi-Xing Cao, Yu-Cheng Gu, Da-Le Guo, and Yun Deng. "Isochromanes from Aspergillus fumigatus, an endophytic fungus from Cordyceps sinensis." Natural Product Research 33, no. 13 (May 24, 2018): 1870–75. http://dx.doi.org/10.1080/14786419.2018.1478824.

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7

Yue, Guizhou, Sicheng Li, Dan Jiang, Gang Ding, Juhua Feng, Huabao Chen, Chunping Yang, et al. "Syntheses of 3,3-Disubstituted Dihydrobenzofurans, Indolines, Indolinones and Isochromanes by Palladium-Catalyzed Tandem Reaction Using Pd(PPh3)2Cl2/(±)-BINAP as a Catalytic System." Catalysts 10, no. 9 (September 18, 2020): 1084. http://dx.doi.org/10.3390/catal10091084.

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A general procedure for the tandem arylation reaction of arylbromide with heteroaryl compounds was developed by using Pd(PPh3)2Cl2/(±)-BINAP (1,1′-Binaphthalene-2,2′-diylbis (diphenylphosphane)) as catalytic system. Both sulphur- and oxygen-containing heterocycles were also employed as an efficient reagent for arylation, which gave moderate to excellent yields with moderate to good regioselectivities (5:1 to > 20:1 ir (isomer ratio)). Except for dihydrobenzofurans, indolines and indolinones, this type of tandem reaction was also expanded to synthesize isochromanes. The synthesized new compounds were well characterized through different spectroscopic techniques, such as 1H and 13C NMR (nuclear magnetic resonance), and mass spectral analysis.

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8

Hashmi, A. Stephen K, M. Wölfle, Filiz Ata, Melissa Hamzic, Ralph Salathé, and Wolfgang Frey. "Gold Catalysis: Dihydroisobenzofurans and Isochromanes by the Intramolecular Furan/Alkyne Reaction." Advanced Synthesis & Catalysis 348, no. 16-17 (November 2006): 2501–8. http://dx.doi.org/10.1002/adsc.200600367.

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9

Guyard, Anne-Laure, Alain Valleix, Bernard Rousseau, and Jean-Christophe Cintrat. "Synthesis and deuterium labeling of some 4-phenyl, 3-substituted isochromanes." Journal of Labelled Compounds and Radiopharmaceuticals 44, no. 7 (2001): 529–39. http://dx.doi.org/10.1002/jlcr.484.

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10

Salomone, Antonio, Filippo Maria Perna, Francesca Claudia Sassone, Aurelia Falcicchio, Jure Bezenšek, Jurij Svete, Branko Stanovnik, Saverio Florio, and Vito Capriati. "Preparation of Polysubstituted Isochromanes by Addition of ortho-Lithiated Aryloxiranes to Enaminones." Journal of Organic Chemistry 78, no. 21 (October 24, 2013): 11059–65. http://dx.doi.org/10.1021/jo401689e.

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11

Tietze, Lutz F., Olaf Burkhardt, and Marielouise Henrich. "Intramolecular Heck Reaction for the Synthesis of Isochromanes under Ambient and High pressure." Liebigs Annalen 1997, no. 5 (May 1997): 887–91. http://dx.doi.org/10.1002/jlac.199719970516.

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12

Ivanov, Iliyan, Stoyanka Nikolova, Ekaterina Kochovska, and Stela Statkova-Abeghe. "Application of ortho-acylated phenylacetic acid esters to the synthesis of 1-substituted isochromanes." Arkivoc 2007, no. 15 (September 21, 2007): 31–44. http://dx.doi.org/10.3998/ark.5550190.0008.f05.

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13

Salomone, Antonio, Filippo Maria Perna, Francesca Claudia Sassone, Aurelia Falcicchio, Jure Bezensek, Jurij Svete, Branko Stanovnik, Saverio Florio, and Vito Capriati. "ChemInform Abstract: Preparation of Polysubstituted Isochromanes by Addition of ortho-Lithiated Aryloxiranes to Enaminones." ChemInform 45, no. 12 (March 6, 2014): no. http://dx.doi.org/10.1002/chin.201412137.

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14

Tyrrell, Elizabeth, Khatebeh Mazloumi, Donatella Banti, Paulina Sajdak, Alex Sinclair, and Adam Le Gresley. "The enantiospecific synthesis of chromanes and isochromanes using a variant of an intramolecular Nicholas reaction." Tetrahedron Letters 53, no. 33 (August 2012): 4280–82. http://dx.doi.org/10.1016/j.tetlet.2012.05.112.

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15

Antonioletti, Roberto, Paolo Bovicelli, Benedetta Crescenzi, and Paolo Lupattelli. "Improved procedure for 3,4-dihydro-1H-2-benzopyran ring closure. A general access to 3-substituted isochromanes." Tetrahedron Letters 39, no. 37 (September 1998): 6751–52. http://dx.doi.org/10.1016/s0040-4039(98)01417-8.

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16

Houpis, Ioannis, Jean-Pierre Van Hoeck, and Ulf Tilstam. "Carboxylate-Directed Kumada Coupling of an Acetaldehyde Synthon with 2-Bromobenzoates Used towards the Synthesis of Isochromanes." Synlett 2007, no. 14 (August 13, 2007): 2179–84. http://dx.doi.org/10.1055/s-2007-985572.

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17

Orue, Ane, Efraím Reyes, Jose L. Vicario, Luisa Carrillo, and Uxue Uria. "Enantio- and Diastereoselective Synthesis of Substituted Tetrahydro-1H-isochromanes through a Dynamic Kinetic Resolution Proceeding under Dienamine Catalysis." Organic Letters 14, no. 14 (July 5, 2012): 3740–43. http://dx.doi.org/10.1021/ol301602h.

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18

Trefiletti, Giuliana, Anna Rita Togna, Valentina Latina, Carolina Marra, Marcella Guiso, and Giuseppina I. Togna. "1-Phenyl-6,7-dihydroxy-isochroman suppresses lipopolysaccharide-induced pro-inflammatory mediator production in human monocytes." British Journal of Nutrition 106, no. 1 (January 27, 2011): 33–36. http://dx.doi.org/10.1017/s0007114510005763.

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Extra-virgin olive oil is an integral ingredient of the Mediterranean diet, and it has been suggested that its high consumption has beneficial effects on human health. Its protective effect, in particular against the development of CVD, has been related not only to the high content of oleic acid, but also to the antioxidant and anti-inflammatory properties of polyphenols. In order to verify the anti-inflammatory and anti-atherogenic properties of hydroxy-isochromans, a class of ortho-diphenols present in extra-virgin olive oil, we investigated the potential ability of 1-phenyl-6,7-dihydroxy-isochroman (L137) to modulate the production of key inflammatory mediators by human monocytes, by evaluating its in vitro effects on prostanoid (thromboxane A2 and PGE2) and cytokine (TNF-α) production. Its effect on the protein expression of the inducible form of cyclo-oxygenase-2 (COX-2), a pro-inflammatory enzyme responsible for elevated prostanoid levels, was also explored. The results showed that L137 significantly inhibited both prostanoid and TNF-α production in lipopolysaccharide-primed human monocytes in a dose-dependent manner, by inhibiting the COX activity of COX-2. We also demonstrated that the effects of the isochroman are mediated, at least partly, through the suppression of NF-κB activation leading to the down-regulation of the synthesis of COX-2.

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19

Ichikawa, Junji, Masahiro Ikeda, and Masahiro Hattori. "Synthesis of Isochromanes and Isothiochromanes Bearing Fluorinated One-Carbon Units via Intramolecular Cyclizations of ortho-Substituted α-(Trifluoromethyl)styrenes." HETEROCYCLES 77, no. 2 (2009): 1285. http://dx.doi.org/10.3987/com-08-s(f)114.

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20

Giles, Robin G. F., Rodney W. Rickards, and Badra S. Senanayake. "Stereoselective isomerisations of 4-(3′,5′-dimethoxyphenyl)-2,5-dimethyl-1,3-dioxolanes. Temperature-dependent formation of either isochromanes or dihydroisobenzofurans." J. Chem. Soc., Perkin Trans. 1, no. 18 (1996): 2241–48. http://dx.doi.org/10.1039/p19960002241.

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21

de Koning, Charles B., Robin G. F. Giles, Ivan R. Green, and Nazeem M. Jahed. "Mercury(II) mediated cyclisation of R-1-(1′-hydroxyethyl)-2-(1″-propenyl)-3-alkoxy-4-methoxybenzenes to chiral isochromanes." Tetrahedron 60, no. 11 (March 2004): 2629–37. http://dx.doi.org/10.1016/j.tet.2004.01.007.

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22

ANTONIOLETTI, R., P. BOVICELLI, B. CRESCENZI, and P. LUPATTELLI. "ChemInform Abstract: Improved Procedure for 3,4-Dihydro-1H-2-benzopyran Ring Closure. A General Access to 3-Substituted Isochromanes." ChemInform 29, no. 52 (June 18, 2010): no. http://dx.doi.org/10.1002/chin.199852163.

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23

Oppong-Danquah, Ernest, Martina Blümel, Silvia Scarpato, Alfonso Mangoni, and Deniz Tasdemir. "Induction of Isochromanones by Co-Cultivation of the Marine Fungus Cosmospora sp. and the Phytopathogen Magnaporthe oryzae." International Journal of Molecular Sciences 23, no. 2 (January 11, 2022): 782. http://dx.doi.org/10.3390/ijms23020782.

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Microbial co-cultivation is a promising approach for the activation of biosynthetic gene clusters (BGCs) that remain transcriptionally silent under artificial culture conditions. As part of our project aiming at the discovery of marine-derived fungal agrochemicals, we previously used four phytopathogens as model competitors in the co-cultivation of 21 marine fungal strains. Based on comparative untargeted metabolomics analyses and anti-phytopathogenic activities of the co-cultures, we selected the co-culture of marine Cosmospora sp. with the phytopathogen Magnaporthe oryzae for in-depth chemical studies. UPLC-MS/MS-based molecular networking (MN) of the co-culture extract revealed an enhanced diversity of compounds in several molecular families, including isochromanones, specifically induced in the co-culture. Large scale co-cultivation of Cosmospora sp. and M. oryzae resulted in the isolation of five isochromanones from the whole co-culture extract, namely the known soudanones A, E, D (1-3) and their two new derivatives, soudanones H-I (4-5), the known isochromans, pseudoanguillosporins A and B (6, 7), naphtho-γ-pyrones, cephalochromin and ustilaginoidin G (8, 9), and ergosterol (10). Their structures were established by NMR, HR-ESIMS, FT-IR, electronic circular dichroism (ECD) spectroscopy, polarimetry ([α]D), and Mosher’s ester reaction. Bioactivity assays revealed antimicrobial activity of compounds 2 and 3 against the phytopathogens M. oryzae and Phytophthora infestans, while pseudoanguillosporin A (6) showed the broadest and strongest anti-phytopathogenic activity against Pseudomonas syringae, Xanthomonas campestris, M. oryzae and P. infestans. This is the first study assessing the anti-phytopathogenic activities of soudanones.

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24

de Koning, Charles B., Ivan R. Green, Joseph P. Michael, and José R. Oliveira. "The synthesis of isochroman-4-ols and isochroman-3-ols: models for naturally occurring benzo[g]isochromanols." Tetrahedron 57, no. 47 (November 2001): 9623–34. http://dx.doi.org/10.1016/s0040-4020(01)00963-2.

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25

Arii, Hidekazu, Kenichi Nakao, Hideki Masuda, and Takayuki Kawashima. "Synthesis of 1-Silabenzo[d,e]isochromanes via Electrophilic Aromatic Substitution of Aldehydes Activated by Silylium Ion." ACS Omega 7, no. 6 (February 1, 2022): 5166–75. http://dx.doi.org/10.1021/acsomega.1c06228.

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26

GILES, R. G. F., R. W. RICKARDS, and B. S. SENANAYAKE. "ChemInform Abstract: Stereoselective Isomerizations of 4-(3′,5′-Dimethoxyphenyl)-2,5- dimethyl-1,3-dioxolanes. Temperature-Dependent Formation of Either Isochromanes or Dihydroisobenzofurans." ChemInform 28, no. 11 (August 4, 2010): no. http://dx.doi.org/10.1002/chin.199711043.

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27

Giles, Robin G. F., Rodney W. Rickards, and Badra S. Senanayake. "Synthesis of isochroman-3-ylacetates and isochromane-γ-lactones through rearrangement of aryldioxolanylacetates." Journal of the Chemical Society, Perkin Transactions 1, no. 23 (1998): 3949–56. http://dx.doi.org/10.1039/a807005i.

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28

de Koning, Charles B., Ivan R. Green, Joseph P. Michael, and Jose R. Oliveira. "ChemInform Abstract: The Synthesis of Isochroman-4-ols and Isochroman-3-ols: Models for Naturally Occurring Benzo[g]isochromanols." ChemInform 33, no. 12 (May 22, 2010): no. http://dx.doi.org/10.1002/chin.200212167.

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29

Giles, Robin G. F., Rodney W. Rickards, and Badra S. Senanayake. "ChemInform Abstract: Synthesis of Isochroman-3-ylacetates and Isochromane-γ-lactones Through Rearrangement of Aryldioxolanylacetates." ChemInform 30, no. 16 (June 16, 2010): no. http://dx.doi.org/10.1002/chin.199916140.

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30

Karapetyan, Vahuni, Satenik Mkrtchyan, Jennifer Hefner, Christine Fischer, and Peter Langer. "Chelation Control in the [3 + 3] Annulation Reaction of Alkoxy-Substituted 1,1-Diacylcyclopropanes with 1,3-Bis(trimethylsilyloxy)-1,3-butadienes. Diversity-Oriented Synthesis of Isochromanes." Journal of Organic Chemistry 75, no. 3 (February 5, 2010): 809–14. http://dx.doi.org/10.1021/jo902334q.

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31

Giles, Robin G. F., Rodney W. Rickards, and Badra S. Senanayake. "Stereoselective isomerisations of 4-(2′,5′-dimethoxyphenyl)-2,5-dimethyl-1,3-dioxolanes and their 2′-chloro-5′-methoxyphenyl analogues. Temperature-dependent diastereoselective formation of isochromanes." Journal of the Chemical Society, Perkin Transactions 1, no. 22 (1997): 3361–70. http://dx.doi.org/10.1039/a704543c.

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32

Verma, Ashish Kumar, Ande Chennaiah, Sateesh Dubbu, and Yashwant D. Vankar. "Stereoselective synthesis of sugar-fused (or 1,2-annulated) isochromans and isochromanones by using oxa-Pictet–Spengler reaction." Organic & Biomolecular Chemistry 16, no. 37 (2018): 8258–62. http://dx.doi.org/10.1039/c8ob01698d.

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33

GILES, R. G. F., R. W. RICKARDS, and B. S. SENANAYAKE. "ChemInform Abstract: Stereoselective Isomerizations of 4-(2′,5′-Dimethoxyphenyl)-2,5-dimethyl-1,3-dioxolanes and Their 2′-Chloro-5′-methoxyphenyl Analogues. Temperature-Dependent Diastereoselective Formation of Isochromanes." ChemInform 29, no. 16 (June 23, 2010): no. http://dx.doi.org/10.1002/chin.199816130.

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34

Karapetyan, Vahuni, Satenik Mkrtchyan, Jennifer Hefner, Christine Fischer, and Peter Langer. "ChemInform Abstract: Chelation Control in the [3 + 3] Annulation Reaction of Alkoxy-Substituted 1,1-Diacylcyclopropanes with 1,3-Bis(trimethylsilyloxy)-1,3-butadienes. Diversity-Oriented Synthesis of Isochromanes." ChemInform 41, no. 22 (June 1, 2010): no. http://dx.doi.org/10.1002/chin.201022063.

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35

Hamada, Shohei, Kyoko Yano, Ayano Ohshimo, Elghareeb E. Elboray, Yusuke Kobayashi, and Takumi Furuta. "Oxidative C–N Bond Formation of Isochromans Using an Electronically Tuned Nitroxyl Radical as Catalyst." SynOpen 08, no. 02 (May 2024): 125–29. http://dx.doi.org/10.1055/s-0040-1720118.

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AbstractThe cross-dehydrogenative coupling between isochromans and nucleophiles using an electronically tuned nitroxyl radical catalyst, which effectively promotes the oxidation of benzylic ethers, has been investigated. Using sulfonamides as a nucleophile, modification of isochromans via oxidative C–N bond formation has been achieved at ambient temperature.

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36

Shen, B. Y., Xue-Hu Li, X. H. Lu, Z. J. Xin, and A. M. Yang. "SYNTHESIS, CRYSTAL STRUCTURE ANALYSIS AND DFT STUDIES OF TWO BENZOSPIROCYCLIC KETONES." Журнал структурной химии 65, no. 4 (2024): 125683. http://dx.doi.org/10.26902/jsc_id125683.

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The functionalized 3H-spiro[isobenzofuran-1,3'-isochromane] skeletons were synthesized in our laboratory with high regioselectivity by palladium-catalyzed intermolecular tandem cycloaddition reaction, two of these derivatives were selected for crystallographic analysis, and the structures of the title compounds were verified by FTIR, 1H NMR and 13C NMR, and MS. The compounds 3a:6'-methoxy-4'-methylene-3H-spiro[isobenzofuran-1,3'-isochromane], C18H16O3 and 3b: 6-fluoro-4-methylene-3'H-spiro[isochromane-3,1'-naphtho[2,3-c]furan ], C21H15O2F. The molecular structure was calculated by density functional theory (DFT) and compared with the x-ray diffraction data. The results of the conformational analysis also showed that the optimized molecular structure obtained by DFT calculations was the same as the optimized molecular structure obtained by X-ray diffraction analysis. In addition, the molecular electrostatic potentials and frontier molecular orbitals of the title compounds were further investigated by using DFT, which revealed the molecular structure features, conformations and some special physicochemical properties of the title compounds.

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37

Liu, Shiyao, Kazunari Nakajima, and Yoshiaki Nishibayashi. "Copper-catalysed enantioselective intramolecular etherification of propargylic esters: synthetic approach to chiral isochromans." RSC Advances 9, no. 33 (2019): 18918–22. http://dx.doi.org/10.1039/c9ra03880a.

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38

Giles, Robin G. F., Ivan R. Green, Yolanta Gruchlik, and Francois J. Oosthuizen. "Asymmetric Syntheses of Isochroman-4,7-diols Through Intramolecular Cyclization of Tethered Lactaldehydes." Australian Journal of Chemistry 53, no. 4 (2000): 341. http://dx.doi.org/10.1071/ch00020.

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Ready cyclization through silica gel chromatography of the asymmetric phenolic lactaldehyde (14) afforded the diastereomeric pair of isochroman-4,7-diols (21) and (23) in good yield, while (17), the benzylic epimer of (14), similarly yielded the isochroman-4,7-diol (25) as a single diastereomer.

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39

Thatikonda, Thanusha, Siddharth K. Deepake, Pawan Kumar, and Utpal Das. "α-Angelica lactone catalyzed oxidation of benzylic sp3 C–H bonds of isochromans and phthalans." Organic & Biomolecular Chemistry 18, no. 21 (2020): 4046–50. http://dx.doi.org/10.1039/d0ob00729c.

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40

Nickerson, Leslie A., Benjamin D. Bergstrom, Mingchun Gao, Yuan-Shin Shiue, Croix J. Laconsay, Matthew R. Culberson, Walker A. Knauss, James C. Fettinger, Dean J. Tantillo, and Jared T. Shaw. "Correction: Enantioselective synthesis of isochromans and tetrahydroisoquinolines by C–H insertion of donor/donor carbenes." Chemical Science 11, no. 19 (2020): 5113. http://dx.doi.org/10.1039/d0sc90081h.

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Correction for ‘Enantioselective synthesis of isochromans and tetrahydroisoquinolines by C–H insertion of donor/donor carbenes’ by Leslie A. Nickerson et al., Chem. Sci., 2020, 11, 494–498, DOI: 10.1039/C9SC05111B.

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41

Tong, Junjie, Yang Zhang, Yang Xu, Yangyang Han, Chuan Li, Wenying Zhuang, and Yongsheng Che. "Spirocitrinols A and B, citrinin derivatives with a spiro[chromane-2,3′-isochromane] skeleton from Penicillium citrinum." RSC Advances 13, no. 9 (2023): 6124–29. http://dx.doi.org/10.1039/d3ra00665d.

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Two new citrinin-derived metabolites spirocitrinols A (1) and B (2) with a spiro[chromane-2,3′-isochromane] skeleton were isolated from cultures of Penicillium citrinum. Compound 1 showed moderate cytotoxicity towards human tumor cells.

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42

Zhu, Zhengbo, Alafate Adili, Chenfei Zhao, and Daniel Seidel. "Catalytic Enantioselective Approaches to the oxa-Pictet–Spengler Cyclization and Other 3,6-Dihydropyran-Forming Reactions." SynOpen 03, no. 03 (July 2019): 77–90. http://dx.doi.org/10.1055/s-0039-1690686.

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This Short Review provides an analysis of the state-of-the-art in catalytic enantioselective oxa-Pictet–Spengler cyclizations. Also discussed are other catalytic reactions providing access to enantioenriched isochromans and tetrahydropyrano[3,4-b]indoles. Context is provided and remaining challenges are highlighted.

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43

Cottet, Françoise, Louis Cottier, and Gérard Descotes. "Photocyclisations de cétoacétals aromatiques en vue d'une approche synthétique de la crombénine." Canadian Journal of Chemistry 68, no. 7 (July 1, 1990): 1251–57. http://dx.doi.org/10.1139/v90-193.

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Crombenin 1 is a spiropeltogynoid compound with a spiroacetal moiety. A similar structure was synthesized starting from an orthocarbonylphenoxyisochroman by a Norrish type II photocyclisation. With an isochroman compound, the aromatic ring induces benzyl radical formation to give chiefly a bicyclic [4.3.1] derivative. However, with the introduction of electron-withdrawing or bulky substituents at C-4′, this side reaction is limited and the spiranic product becomes preponderant. Keywords: acetals, isochroman, photocyclisation, spiroacetals.

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44

Yang, Guoping, Ke Li, Kai Zeng, Yijin Li, Tao Yu, and Yufeng Liu. "Heteropolyacid ionic liquid heterogeneously catalyzed synthesis of isochromans via oxa-Pictet–Spengler cyclization in dimethyl carbonate." RSC Advances 11, no. 18 (2021): 10610–14. http://dx.doi.org/10.1039/d1ra01004b.

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An efficient heterogeneous and green catalyst [HEMTH]H₂[PMo₁₂O₄₀] was prepared to catalysis the oxa-Pictet–Spengler cyclization of arylethanols and aldehydes to afford isochromans with excellent yields using dimethyl carbonate as a green solvent.

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45

Huo, Congde, Mingxia Wu, Fengjuan Chen, Xiaodong Jia, Yong Yuan, and Haisheng Xie. "Catalytic amounts of CBr4 mediated dehydrogenative coupling of isochromans with aromatic ketones." Chemical Communications 51, no. 22 (2015): 4708–11. http://dx.doi.org/10.1039/c4cc09922b.

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In the presence of catalytic amounts of CBr₄ (a metal-free mediator), an unexpected oxidative dehydrogenative coupling of isochromans with ketones occurred to construct new C^sp3–C^sp3 bonds. The reactions were performed under simple solvent-free aerobic conditions.

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46

Wang, Hui-Hong, Xiao-Dong Wang, Fei Cao, Wei-Wei Gao, Shu-Meng Ma, Zhao Li, Xue-Mei Deng, Tao Shi, and Zhen Wang. "Application of palladium-catalyzed aryl C–H alkylation in total synthesis of (−)-berkelic acid." Organic Chemistry Frontiers 8, no. 1 (2021): 82–86. http://dx.doi.org/10.1039/d0qo01003k.

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47

UNTERHALT, B., and R. JOESTINGMEIER. "ChemInform Abstract: New Substituted Isochromans." ChemInform 28, no. 1 (August 4, 2010): no. http://dx.doi.org/10.1002/chin.199701169.

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48

OLORUNSOLA, OLUWATOBI, OLUWASEYE DADA, and PENGQIAN WANG. "A SPINNING POLARIZER AND SPINNING ANALYZER METHOD FOR VISUALIZING THE ISOCHROMATES IN CONOSCOPIC INTERFEROMETERS." International Journal of Modern Physics B 27, no. 30 (November 7, 2013): 1350175. http://dx.doi.org/10.1142/s0217979213501750.

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We have developed a spinning polarizer and spinning analyzer (SPSA) method to visualize the whole isochromatic fringes in conoscopic interferometers for the study of optically anisotropic materials. This simple method completely eliminates the broad and dark isogyre fringes appearing in a conventional conoscopic interferometer where a linear polarizer and a linear analyzer (LPLA) are used. Our method allows the direct visualization of the isochromates on the viewing screen by eyes in real time, without the need of additional optics or detectors other than those used in a conventional conoscopic interferometer, and no additional computation is required. This method works at any polarization state of the input light, and at any wavelength permitted by the polarizers. In the case of polychromatic illumination our method reveals the isochromates of all colors indiscriminatively, in comparison to the method of circular polarizer and circular analyzer (CPCA), which is considerably subject to spectrum modulation due to the dispersion in the retardation of the quarter-wave plates. The proposed method is demonstrated in a lithium niobate ( LiNbO 3) crystal driven by an external electric field.

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Zhang, Ying-Qi, Xin-Qi Zhu, Yin Xu, Hao-Zhen Bu, Jia-Le Wang, Tong-Yi Zhai, Jin-Mei Zhou, and Long-Wu Ye. "Synthesis of functionalized 3-isochromanones via metal-free intramolecular alkoxylation-initiated cascade cyclization." Green Chemistry 21, no. 11 (2019): 3023–28. http://dx.doi.org/10.1039/c9gc01030k.

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Vankar, Yashwant, Parasuraman Rajasekaran, and Yakkala Mallikharjunarao. "Synthesis of 1C-Aryl/Alkyl 2C-Branched Sugar-Fused Isochroman Derivatives by Sequential Prins and Friedel–Crafts Cyclizations on a Perlin Aldehyde Derived Substrate." Synlett 28, no. 11 (March 9, 2017): 1346–52. http://dx.doi.org/10.1055/s-0036-1588156.

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The synthesis of C-aryl/alkyl 2C-branched sugar-fused isochromans by using a carbohydrate-derived starting material is described. Our approach makes use of sequential Prins and Friedel–Crafts cyclizations in which a Perlin aldehyde derived homoallylic alcohol is converted into the target molecule. This strategy works well with many aldehydes and gives good yields with excellent selectivity.

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Journal articles on the topic 'Isochromanes'

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