A novel transformation of N-alkoxycarbonylprolines 1 to 4-trifluoroacetyl-2,3-dihydropyrroles 2 was efficiently realized by utilizing trifluoroacetic anhydride, in which probable intermediates were mesoionic 1,3-oxazolium-5-olates B.
General Approach to Amides through Decarboxylative Radical Cross-Coupling of Carboxylic Acids and Isocyanides
作者:Qing Yan、Qing-Jia Yuan、Andrey Shatskiy、Gregory R. Alvey、Elena V. Stepanova、Jian-Quan Liu、Markus D. Kärkäs、Xiang-Shan Wang
DOI:10.1021/acs.orglett.4c00872
日期:2024.4.26
silver-catalyzed protocol for decarboxylative cross-coupling between carboxylicacids and isocyanides, leading to linear amide products through a free-radical mechanism. The disclosed approach provides a general entry to a variety of decorated amides, accommodating a diverse array of radical precursors, including aryl, heteroaryl, alkynyl, alkenyl, and alkyl carboxylicacids. Notably, the protocol proved to
[EN] MICROORGANISM AND ESTERASE OBTAINED THEREFROM<br/>[FR] MICRO-ORGANISME ET ESTERASE OBTENUE A PARTIR DE CE MICRO-ORGANISME
申请人:CHIROTECH TECHNOLOGY LIMITED
公开号:WO1999004015A1
公开(公告)日:1999-01-28
(EN) A novel microorganism is characterised by the ability to produce (S)-N-benzoyl-2-azetidinecarboxylic acid, in at least 99 % enantiomeric excess, from racemic N-benzoyl-2-azetidinecarboxylic acid methyl ester. An enzyme has been obtained from the organism, and has the same or opposite enantioselectivity.(FR) Un nouveau micro-organisme est caractérisé par son aptitude à produire de l'acide (S)-N-benzoyl-2-azétidinecarboxylique, avec au moins 99 % d'énantiomères en excès, à partir d'un méthyl-ester d'acide N-benzoyl-2-azétidinecarboxylique racémique. Une enzyme présentant la même sélectivité énantiomère ou une sélectivité énantiomère opposée a été extraite de ce micro-organisme.