ASYMMETRIC-SYNTHESIS OF UNUSUAL AMINO-ACIDS - SYNTHESIS OF OPTICALLY PURE ISOMERS OF N-INDOLE-(2-MESITYLENESULFONYL)-BETA-METHYLTRYPTOPHAN

被引：49

作者：

BOTEJU, LW ^{[1
]}

WEGNER, K ^{[1
]}

QIAN, XH ^{[1
]}

HRUBY, VJ ^{[1
]}

机构：

[1] UNIV ARIZONA,DEPT CHEM,TUCSON,AZ 85721

来源：

TETRAHEDRON | 1994年 / 50卷 / 08期

关键词：

D O I：

10.1016/S0040-4020(01)86957-X

中图分类号：

O62 [有机化学];

学科分类号：

070303 ; 081704 ;

摘要：

We have developed methods for the synthesis of the four optically pure isomers of beta-methyltryptophan with the 2-mesitylenesulfonyl indole protecting group for peptide synthesis. Starting from 3-indoleacrylic acid, the beta-methyl function was generated by a chiral auxiliary-directed asymmetric conjugate I,il-addition. Asymmetric bromination was achieved via a tandem addition of N-bromosuccinimide to the enolate formed by the conjugate addition. Displacement of the bromide by azide, hydrolysis of the chiral auxiliary and then reduction, led to the two erythro isomers. Chiral imide enolate azidation of the conjugate adduct, hydrolysis of the chiral auxiliary and reduction yielded the two three isomers in high optical purity.

引用

页码：2391 / 2404

页数：14

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