E-mail: parkyong@konkuk.ac.krReceived August 26, 2011, Accepted September 5, 2011关键词:动态动力学拆分,亲核取代,苹果酸,手性助剂,不对称合成手性助剂介导的α-卤代酯动态拆分被称为不对称合成α-杂原子取代羧酸衍生物的有效方法。
Dynamic kinetic resolution of (S)-mandelate-derived α-bromo esters in nucleophilic substitution and asymmetric syntheses of 3-substituted morpholin-2-ones
作者:Yong Sun Park、Yoon Min Lee、Kyoung Hee Kang、Hye-Min Min、Hyun Jin Lim、Eun-Hyung Park
DOI:10.3998/ark.5550190.0011.201
日期:——
Dynamickineticresolution of (S)-mandelate-derivedα-bromoesters in nucleophilicsubstitution reaction has been investigated. Substitutions with various alkyl amine nucleophiles in the presence of TBAI and DIEA can provide various α-amino esters up to 81% yield and 97:3 dr. Also, the substitution of α-bromoesters with N-substituted 2-aminoethanol nucleophiles and following spontaneous cyclization
L-Tartaric Acid as a New Chiral Auxiliary for Asymmetric Synthesis of Piperazinones, Morpholinones, Dihydroquinoxalinones and Dihydrobenzoxazinones
作者:Yelim Kim、Kon Ji Park、Yong Sun Park
DOI:10.5012/bkcs.2012.33.11.3853
日期:2012.11.20
2012, Accepted August 10, 2012Key Words : Dynamic resolution, Nucleophilic substitution, Tartaricacid, Chiralauxiliary, Asymmetric syn-thesisDynamic resolution of α-haloacyl compounds in nucleo-philic substitution has been recently developed as an asym-metric synthetic method for α-substituted carboxylic acids.