There are provided processes for making rivastigmine. In one embodiment, the process includes reacting S-(−)-[1-(3-hydroxyphenyl)ethyl]dimethylamine with N-ethyl-N-methyl carbamoyl chloride in the presence of an organic base to obtain a free base of rivastigmine.
A highly diastereoselective and enantioselectiveBrønstedacidcatalyzedreductive condensation of N−H imines was developed. This reaction is catalyzed by a chiral disulfonimide (DSI), uses Hantzsch esters as a hydrogen source, and delivers useful C2‐symmetric secondary amines.
The compound represented by formula (1):
wherein
R
4
and R
5
each represents a hydrogen atom, a halogen atom, or a C1-C3 alkyl group; R
6
represents a C1-C4 alkyl group, a C3-C6 cycloalkyl group, or the like; R
7
, R
8
, and R
9
each represents a hydrogen atom, a halogen atom, or the like; R
10
represents a C1-C3 alkyl group, or the like; R
13
represents a C1-C3 alkyl group, or the like; and Q represents a phenyl group, or the like;
has an excellent control effect on pests.
Asymmetric Synthesis of Vicinal Tetrasubstituted Diamines via Reductive Coupling of Ketimines Templated by Chiral Diborons
作者:Mingkang Zhou、Yaodong Lin、Xiao‐Xuan Chen、Guangqing Xu、Lung Wa Chung、Wenjun Tang
DOI:10.1002/anie.202300334
日期:——
A series of chiral vicinaltetrasubstituted diamines are prepared with high ee values and good to excellent yields via an unprecedented chiral diboron-templated asymmetric homocoupling of aryl alkyl ketimines. The synthetic value of these chiral vicinaltetrasubstituted diamines is demonstrated by the development of efficient organocatalysts for the asymmetric α-bromination of aliphatic aldehydes.
通过前所未有的手性二硼模板化芳基烷基酮亚胺的不对称自偶联,制备了一系列具有高 ee 值和良好至极佳产率的手性邻位四取代二胺。这些手性邻位四取代二胺的合成价值通过开发用于脂肪醛不对称α-溴化的高效有机催化剂得到证明。
A process for the preparation of rivastigmine or a salt thereof
申请人:Dr. Reddy's Laboratories Ltd.
公开号:EP1980552A2
公开(公告)日:2008-10-15
There are provided processes for making rivastigmine. In one embodiment, the process includes reacting S-(-)-[1-(3-hydroxyphenyl)ethyl]dimethylamine with N-ethyl-N-methyl carbamoyl chloride in the presence of an organic base to obtain a free base of rivastigmine.