An efficient asymmetric synthesis of (3S)-3-amino-1-(4-cyanophenyl)-2-oxopyrrolidine hydrochloride salt
摘要:
Reaction of 4-aminobenzonitrile with 2-bromo-4-chlorobutyryl bromide in the presence of sodium phosphate followed by treatment of the coupled product with sodium hydroxide followed by ammonium hydroxide in acetonitrile yielded the title compound as the racemic (R)-(-)-mandelic acid salt in an overall yield of 64%. The title compound was then obtained with an ee >96% and in 78% yield after a dynamic resolution of the racemic salt in IPA using a catalytic amount of salicylaldehyde followed by salt exchange. (C) 1998 Elsevier Science Ltd. All rights reserved.
对取代的4-氯-N-苯基丁酰胺在氢氧化钠水溶液中的化学行为的研究表明,底物首先进行闭环反应,得到取代的1-苯基吡咯烷二-2-酮,然后水解为4-钠的取代衍生物。氨基-N-苯基丁酸酯。动力学测量提供了在25°C水中2-溴-4-氯-N-(4-硝基苯基)丁酰胺的解离常数p K a和环化速率常数k c的值[p K a = 11.64±0.01; k c =(1.94±0.03)×10 -2 s -1 ],4-氯-N-(4-硝基苯基)丁酰胺[p K a = 13.35±0.02;k c =(1.60±0.02)×10 -2 s -1 ]和4-氯-2-甲基-N-(4-硝基苯基)丁酰胺[p K a = 13.55±0.03;k c =(7.61±0.11)×10 -2 s -1 ]。各个衍生物的p K a和k c值因丁酰胺骨架的α位取代而异。在甲醇钠甲醇溶液中,2-溴-4-氯-N的闭环过程-(
PROCESS FOR THE PREPARATION OF A 2-OXOPYRROLIDINE COMPOUND
申请人:G.D. SEARLE & CO.
公开号:EP1068183A2
公开(公告)日:2001-01-17
US5986107A
申请人:——
公开号:US5986107A
公开(公告)日:1999-11-16
[EN] PROCESS FOR THE PREPARATION OF A 2-OXOPYRROLIDINE COMPOUND<br/>[FR] PROCEDE DE PREPARATION D'UN COMPOSE DE 2-OXOPYRROLIDINE
申请人:——
公开号:WO1999051573A2
公开(公告)日:1999-10-14
[EN] A process for producing a lactam of formula (I). [FR] L'invention porte sur un procédé de production d'un lactame de formule (I).
An efficient asymmetric synthesis of (3S)-3-amino-1-(4-cyanophenyl)-2-oxopyrrolidine hydrochloride salt
作者:Pierre-Jean Colson、Claire A. Przybyla、Bruce E. Wise、Kevin A. Babiak、Lisa M. Seaney、Donald E. Korte
DOI:10.1016/s0957-4166(98)00260-2
日期:1998.8
Reaction of 4-aminobenzonitrile with 2-bromo-4-chlorobutyryl bromide in the presence of sodium phosphate followed by treatment of the coupled product with sodium hydroxide followed by ammonium hydroxide in acetonitrile yielded the title compound as the racemic (R)-(-)-mandelic acid salt in an overall yield of 64%. The title compound was then obtained with an ee >96% and in 78% yield after a dynamic resolution of the racemic salt in IPA using a catalytic amount of salicylaldehyde followed by salt exchange. (C) 1998 Elsevier Science Ltd. All rights reserved.
Kinetics and mechanism of formation and decomposition of substituted 1-phenylpyrrolidin-2-ones in basic medium
different derivatives and depend on the substituents in the aromatic and/or heterocyclic moiety. The rate-limiting step of hydrolysis of 1-(4-nitrophenyl)pyrrolidin-2-one consists of the non-catalysed decomposition of the tetrahedral intermediate. In the case of 3-bromo-1-(4-nitrophenyl)pyrrolidin-2-one at sodium hydroxide concentrations below 0.1 mol l−1, the rate-limiting step is the second reaction pathway
对取代的4-氯-N-苯基丁酰胺在氢氧化钠水溶液中的化学行为的研究表明,底物首先进行闭环反应,得到取代的1-苯基吡咯烷二-2-酮,然后水解为4-钠的取代衍生物。氨基-N-苯基丁酸酯。动力学测量提供了在25°C水中2-溴-4-氯-N-(4-硝基苯基)丁酰胺的解离常数p K a和环化速率常数k c的值[p K a = 11.64±0.01; k c =(1.94±0.03)×10 -2 s -1 ],4-氯-N-(4-硝基苯基)丁酰胺[p K a = 13.35±0.02;k c =(1.60±0.02)×10 -2 s -1 ]和4-氯-2-甲基-N-(4-硝基苯基)丁酰胺[p K a = 13.55±0.03;k c =(7.61±0.11)×10 -2 s -1 ]。各个衍生物的p K a和k c值因丁酰胺骨架的α位取代而异。在甲醇钠甲醇溶液中,2-溴-4-氯-N的闭环过程-(