Chiral rhodium(II)-catalyzed asymmetric aldol-type interception of an oxonium ylide to assemble chiral 2,3-dihydropyrans
作者:Aimin Xu、Xiaoyu Zhou、Rimei Zheng、Zhijing Zhang、Xinru Yin、Kemiao Hong、Zhuofeng Ke、Yu Qian、Wenhao Hu
DOI:10.1007/s11426-022-1275-9
日期:2022.8
A chiral dirhodium complex is an effective and robust catalyst for asymmetric carbene transformations. However, dirhodium-catalyzed asymmetric ylide interception processes are rare, mainly because of the dissociation of the metal catalyst before the stereo-determining step. Herein, we report a chiral dirhodium(II)-catalyzed asymmetricannulation of vinyl diazoesters with α-hydroxyl ketones, which provides
Oxidative Coupling of Terminal Alkyne with α-Hydroxy Ketone: An Expedient Approach toward Ynediones
作者:Zeguang Zhang、Xuefeng Jiang
DOI:10.1021/ol502298a
日期:2014.9.5
An efficient and mild copper-catalyzed one-pot approach toward ynediones has been established. A variety of ynediones were constructed directly through oxidative coupling of alkyne with alpha-hydroxy ketone. Oxygen-oxidizing and neutral conditions in one-pot for a wide range of substrates including natural product derivatives make this transformation highly efficient and practical. On the basis of control experiments, in situ IR measurements, and isotopic labeling experiments, a plausible mechanism involving intermediate phenylglyoxal was drawn. Applications by synthesis of various heterocycles were also investigated.
[EN] NOVEL AND IMPROVED PROCESSES FOR THE PREPARATION OF INTERMEDIATES OF DARIFENACIN, DARIFENACIN AND ITS PHARMACEUTICALLY ACCEPTABLE SALTS<br/>[FR] PROCÉDÉS NOUVEAUX ET PERFECTIONNÉS POUR LA PRÉPARATION D'INTERMÉDIAIRES DE DARIFÉNACINE, DE LA DARIFÉNACINE ET DE SES SELS PHARMACEUTIQUEMENT ACCEPTABLES
申请人:SATYANARAYANA REDDY MANNE
公开号:WO2008126106A2
公开(公告)日:2008-10-23
(EN) The present invention relates to novel and improved processes for the preparation of intermediates of darifenacin, darifenacin and its pharmaceutically acceptable salts. Darifenacin is chemically known as 3 -(S)-(-)-(l -carbamoyl- 1,1 -diphenylmethyl)-l- [2- (2,3-dihydro benzofuran-5-yl)ethyl]pyrrolidine and represented by formula (II). The invention also relates to the novel polymorphs of the pharmaceutically acceptable salts of darifenacin and the methods for their preparation.(FR) La présente invention porte sur des procédés nouveaux et perfectionnés pour la préparation d'intermédiaires de darifénacine, de la darifénacine et de ses sels pharmaceutiquement acceptables. La darifénacine est connue chimiquement comme étant la 3-(S)-(-)-(l-carbamoyl-1,1 -diphénylméthyl)-l- [2-(2,3-dihydro benzofuran-5-yl)éthyl]pyrrolidine et est représentée par la formule 2. L'invention porte également sur les nouveaux polymorphes des sels pharmaceutiquement acceptables de la darifénacine et sur les procédés pour leur préparation.