Asymmetric synthesis of quaternary α-amino acids using D-ribonolactone acetonide as chiral auxiliary

被引:14
|
作者
Moreno-Mañas, M [1 ]
Trepat, E [1 ]
Sebastián, RM [1 ]
Vallribera, A [1 ]
机构
[1] Univ Autonoma Barcelona, Dept Chem, E-08193 Barcelona, Spain
关键词
D O I
10.1016/S0957-4166(99)00457-7
中图分类号
O61 [无机化学];
学科分类号
070301 ; 081704 ;
摘要
We describe a new simple methodology to prepare enantiopure alpha,alpha-dialkylglycines based on the use of commercially available D-ribonolactone as a chiral auxiliary. Enantiopure alpha-methyl and alpha-butyl series are prepared through diastereoselective alkylation and subsequent Schmidt rearrangement of alpha,alpha-dialkylacetoacetates of D-ribonolactone acetonide. Absolute configuration was assigned through preparation of enantiopure 4,4-disubstituted 3-methyl-2-pyrazolin-5-ones. (C) 1999 Elsevier Science Ltd. All rights reserved.
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页码:4211 / 4224
页数:14
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