Enantiospecific synthesis of 3-aza-6,8-dioxa-bicyclo[3.2.1]octane carboxylic acids from erythrose

被引:27
作者
Trabocchi, A
Menchi, G
Rolla, M
Machetti, F
Bucelli, I
Guarna, A
机构
[1] Univ Florence, Dipartimento Chim Organ Ugo Schiff, I-50019 Florence, Italy
[2] CNR, Ist Chim Composti Organmet, I-50019 Florence, Italy
关键词
amino acids and derivatives; peptide mimetics; amination; bicyclic heterocyclic compounds;
D O I
10.1016/S0040-4020(03)00773-7
中图分类号
O62 [有机化学];
学科分类号
070303 ; 081704 ;
摘要
New methodology for the synthesis of enantiopure 3-aza-6,8-dioxa-bicyclo[3.2.1]octane-carboxylic acids belonging to 7-endo-BTAa sub-class of gamma/delta amino acids is described. The novelty is the use of 2,3-O-isopropylidene-erythrose instead of meso-tartaric acid derivative, thus allowing us to perform an enantiospecific synthesis. Reductive amination of erythrolactol with aminoacetaldehyde diethylacetal or benzylamine, and subsequent acid cyclisation gave directly the amino alcohol scaffold. Protection of nitrogen as urethane and final alcohol oxidation afforded the Fmoc-, Boc-, and Cbz-amino acids. The new synthetic route was applied to multigram scale, thus resulting in a marked improvement of the synthesis of enantiopure 7-endo-BTG and 7-endo-BTK amino acids. (C) 2003 Elsevier Science Ltd. All rights reserved.
引用
收藏
页码:5251 / 5258
页数:8
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