Littérature scientifique sur le sujet « Bifunctional chiral catalysts »
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Articles de revues sur le sujet "Bifunctional chiral catalysts"
Vazquez-Chavez, Josué, Socorro Luna-Morales, Diego A. Cruz-Aguilar, Howard Díaz-Salazar, Wilmer E. Vallejo Narváez, Rodrigo S. Silva-Gutiérrez, Simón Hernández-Ortega, Tomás Rocha-Rinza et Marcos Hernández-Rodríguez. « The effect of chiral N-substituents with methyl or trifluoromethyl groups on the catalytic performance of mono- and bifunctional thioureas ». Organic & ; Biomolecular Chemistry 17, no 47 (2019) : 10045–51. http://dx.doi.org/10.1039/c9ob01893j.
Texte intégralChen, Jianfeng, Xing Gong, Jianyu Li, Yingkun Li, Jiguo Ma, Chengkang Hou, Guoqing Zhao, Weicheng Yuan et Baoguo Zhao. « Carbonyl catalysis enables a biomimetic asymmetric Mannich reaction ». Science 360, no 6396 (28 juin 2018) : 1438–42. http://dx.doi.org/10.1126/science.aat4210.
Texte intégralWu, Jia-Hong, Jianke Pan et Tianli Wang. « Dipeptide-Based Phosphonium Salt Catalysis : Application to Enantioselective Synthesis of Fused Tri- and Tetrasubstituted Aziridines ». Synlett 30, no 19 (27 août 2019) : 2101–6. http://dx.doi.org/10.1055/s-0039-1690192.
Texte intégralHu, Xiao-Mu, Rui Zhang, Hai Dong, Yan-Yan Jia, Guo-Qiang Bao et Ping-An Wang. « Chiral bifunctional organocatalysts for enantioselective synthesis of 3-substituted isoindolinones ». RSC Advances 13, no 35 (2023) : 24460–65. http://dx.doi.org/10.1039/d3ra04350a.
Texte intégralYoshida, Yasushi, Tatsuya Ao, Takashi Mino et Masami Sakamoto. « Chiral Bromonium Salt (Hypervalent Bromine(III)) with N-Nitrosamine as a Halogen-Bonding Bifunctional Catalyst ». Molecules 28, no 1 (2 janvier 2023) : 384. http://dx.doi.org/10.3390/molecules28010384.
Texte intégralKamal, Shagufta, Ameer Fawad Zahoor, Sajjad Ahmad, Rabia Akhtar, Iqra Khaliq, Wajiha Qurban et Attia Mehreen. « Recent Trends in the Development of Novel Catalysts for Asymmetric Michael Reaction ». Current Organic Chemistry 24, no 13 (1 octobre 2020) : 1397–458. http://dx.doi.org/10.2174/1385272824999200616123744.
Texte intégralKitamura, Masato, Kengo Miyata, Tomoaki Seki, Namdev Vatmurge et Shinji Tanaka. « CpRu-catalyzed asymmetric dehydrative allylation ». Pure and Applied Chemistry 85, no 6 (15 avril 2013) : 1121–32. http://dx.doi.org/10.1351/pac-con-12-10-02.
Texte intégralIkariya, Takao, Shigeki Kuwata et Yoshihito Kayaki. « Aerobic oxidation with bifunctional molecular catalysts ». Pure and Applied Chemistry 82, no 7 (4 mai 2010) : 1471–83. http://dx.doi.org/10.1351/pac-con-09-09-11.
Texte intégralRuan, Sai, Xiaobin Lin, Lihua Xie, Lili Lin, Xiaoming Feng et Xiaohua Liu. « Asymmetric synthesis of 3-aminodihydrocoumarins via the chiral guanidine catalyzed cascade reaction of azlactones ». Organic Chemistry Frontiers 5, no 1 (2018) : 32–35. http://dx.doi.org/10.1039/c7qo00768j.
Texte intégralNishiyori, Ryuichi, Ken Okuno, Bun Chan et Seiji Shirakawa. « Chiral Bifunctional Selenide Catalysts for Asymmetric Iodolactonizations ». Chemical and Pharmaceutical Bulletin 70, no 9 (1 septembre 2022) : 599–604. http://dx.doi.org/10.1248/cpb.c22-00049.
Texte intégralThèses sur le sujet "Bifunctional chiral catalysts"
Kong, Julie. « Design, synthesis and applications of new chiral bifunctional iminophosphorane - thiourea organocatalysts. Organophotocatalytic addition of unactivated alkenes with silicon enolate ». Electronic Thesis or Diss., université Paris-Saclay, 2024. http://www.theses.fr/2024UPASF018.
Texte intégralThe PhD work focuses on the development of new bifunctional chiral organocatalysts and their applications in asymmetric organocatalysis. For this purpose, we first studied the design and synthesis of new chiral organocatalysts possessing an iminophosphorane function, on the one hand, and a hydrogen bond donor function, on the other hand. Thus, several families of bifunctional chiral organocatalysts based on L-proline and (S)-pyroglutamic acid have been synthesized in a few steps with moderate to good overall yields. These new catalysts were subsequently evaluated in various asymmetric reactions. The great potential of these catalysts has been demonstrated in the synthesis of α-acyloxythioester through enantioselective acyl transfer /protonation of α-acyloxy-β-ketosulfides. Very good yields (up to 94%) and enantioselectivities (up to 98%) were obtained. The best performing catalyst was then immobilized on a resin support and evaluated in the same reaction. Generally speaking, the reactions worked well leading to the formation of the expected products in good yields and enantioselectivity. During this work, the exploration of a new methodology for the functionalization of non-activated alkenes by organophotocatalytic route was studied. Olefins represent a large class of chemical compounds. Several methods have been developed for the functionalization of activated alkenes. However, the functionalization of non-activated alkenes remains a synthetic challenge. Therefore, developing new synthetic tools to solve this problem remains a challenge for organic chemists
Isik, Murat. « Chiral 2-aminodmap/sulfonamides And Squaramides Asbifunctional Acid/base Organocatalysts In Asymmetriccatalysis ». Phd thesis, METU, 2011. http://etd.lib.metu.edu.tr/upload/12613444/index.pdf.
Texte intégral)-nitrostyrene. Enantiomeric excesses (ee) up to 93% were attained.
Chassillan, Louis. « New Chiral Bifunctional Organocatalysts : Synthesis and Application in Enantioselective Reactions Under Batch and Continuous-Flow Conditions ». Thesis, université Paris-Saclay, 2022. http://www.theses.fr/2022UPASF027.
Texte intégralAsymmetric organocatalysis field has known an important expansion in the past years and powerful synthetic tools have been developed to perform fast and selective reactions. However, regarding the increasing use of chiral molecules and drugs in the industry, especially in pharmaceutical industry, it is crucial to design new catalysts in order to synthesize valuable chiral molecules in a more efficient manner. For that, bifunctional organocatalysts appear to be an efficient approach as the synergistic activation of nucleophile and electrophile usually allows better control of the selectivity and shorter reaction times. Moreover, the reusability of catalysts has become a major concern in the recent years as recycling allows a significant reduction in resources commonly associated with extraction or transportation and processing of industrial catalysts. Therefore, the heterogenization of chiral catalysts seems to be a very attractive approach for industrial applications. Considering all those concerns, we decided to focus on synthesizing novel chiral bifunctional catalysts and heterogenizing them to perform heterogeneous catalysis under batch and continuous-flow conditions. In the first part, guanidine-thiourea catalysts were successfully synthesized and applied for the enantioselective hydrophosphonylation reaction of imines providing a large scope of α-amino phosphonates with high yields and high ee. The 1,4-Michael addition of malonates to trans-β-nitrostyrene was also investigated. In the second part, the newly synthesized guanidine-thiourea catalysts were heterogenized by polymerization with styrene and the resulting polymer was used for the asymmetric Pudovik reaction under continuous-flow conditions. Finally, new prolineamide catalysts were synthesized in the last part and their efficiency for the aldol reaction of trifluoro acetophenone and acetone was investigated
Lishchynskyi, Anton. « Development of new methods for the asymmetric formation of C-N bonds ». Thesis, Strasbourg, 2012. http://www.theses.fr/2012STRAF026.
Texte intégralThe concept of metal-ligand bifunctionality was successfully applied for an enantioselective aza-Michael reaction by employing well-defined ruthenium amido complexes. The catalyst was optimised and the corresponding chiral indoline β-amino acid derivatives were obtained with high enantioselectivities. Next, a straightforward enantioselective bifunctional organocatalytic approach was also developed. Employing hydroquinidine as catalyst the corresponding cyclic products were obtained in excellent enantioselectivities and quantitative yields. These compounds can be selectively deprotected and applied to peptide synthesis. Finally, we have developed unprecedented diamination reactions of styrenes, butadienes and hexatrienes employing easily accessible hypervalent iodine(III) reagents under robust reaction conditions. The first examples of the metal-free 1,2-diamination of butadienes were demonstrated and this oxidation methodology was further extended to the highly attractive 1,4 installation of two nitrogen atoms within a single step
Yalalov, Denis. « Bifunctional Thiourea-Based Organocatalysts for Asymmetric C-C Bond Formation Reactions : Strecker, Nitro-Michael, Mannich ». Doctoral thesis, 2007. http://hdl.handle.net/11858/00-1735-0000-0006-ACA2-6.
Texte intégralChapitres de livres sur le sujet "Bifunctional chiral catalysts"
Pápai, I. « Bifunctional Catalysis by Chiral Amines ». Dans Brønsted Base and Acid Catalysts, and Additional Topics, 1. Georg Thieme Verlag KG, 2012. http://dx.doi.org/10.1055/sos-sd-205-00469.
Texte intégralGouverneur, V., et O. Lozano. « Asymmetric Fluorination with Chiral Bifunctional Phase-Transfer Catalysts ». Dans Stereoselective Pericyclic Reactions, Cross Coupling, and C—H and C—X Activation, 1. Georg Thieme Verlag KG, 2011. http://dx.doi.org/10.1055/sos-sd-203-00570.
Texte intégralHatakeyama, S. « Using Chiral Bifunctional 2′-Phosphino-1,1′-binaphthalen-2-ol-Based Catalysts ». Dans Lewis Base and Acid Catalysts, 1. Georg Thieme Verlag KG, 2012. http://dx.doi.org/10.1055/sos-sd-204-00355.
Texte intégralHatakeyama, S. « Using A Chiral Bifunctional 1,1′-Bi-2-naphthol-Derived Aryldiphenylphosphine Catalyst ». Dans Lewis Base and Acid Catalysts, 1. Georg Thieme Verlag KG, 2012. http://dx.doi.org/10.1055/sos-sd-204-00357.
Texte intégralHatakeyama, S. « Using Chiral Bifunctional and Trifunctional 2′-Phosphino-1,1′-binaphthalen-2-amine-Based Catalysts ». Dans Lewis Base and Acid Catalysts, 1. Georg Thieme Verlag KG, 2012. http://dx.doi.org/10.1055/sos-sd-204-00356.
Texte intégralWard, Robert S. « Allyl compounds ». Dans Bifunctional Compounds. Oxford University Press, 1994. http://dx.doi.org/10.1093/hesc/9780198558088.003.0009.
Texte intégralLambert, Tristan H. « Construction of Single Stereocenters ». Dans Organic Synthesis. Oxford University Press, 2017. http://dx.doi.org/10.1093/oso/9780190646165.003.0031.
Texte intégralLiu, Yanyong, Toshiaki Hanaoka, Kazuhisa Murata et Kinya Sakanishi. « Hydroisomerization and hydrocracking of long chain n-alkane and Fischer-Tropsch wax over bifunctional Pt-promoted Al-HMS catalysts ». Dans Recent Progress in Mesostructured Materials - Proceedings of the 5th International Mesostructured Materials Symposium (IMMS2006), Shanghai, P.R. China, August 5-7, 2006, 781–85. Elsevier, 2007. http://dx.doi.org/10.1016/s0167-2991(07)80436-8.
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