5-METHOXY-PENTONO-1,4-LACTONES FROM (R)-2-HYDROXY-5-METHOXY-3-PENTENOIC ACID OBTAINED BY BIOREDUCTION OF THE 2-OXO ACID

被引:14
作者
BONNAFFE, D [1 ]
SIMON, H [1 ]
机构
[1] TECH UNIV MUNICH,LEHRSTUHL ORGAN CHEM & BIOCHEM,LICHTENBERGSTR 4,W-8046 GARCHING,GERMANY
关键词
D O I
10.1016/S0040-4020(01)81186-8
中图分类号
O62 [有机化学];
学科分类号
070303 ; 081704 ;
摘要
Various 5-methoxy-pentono-1,4-lactones and derivates thereof were synthesised from propargyl alcohol or its methyl ether. The key step was the enantioselective reduction of 2-oxo-5-alkoxy-3-pentenoic acids by resting cells of Proteus vulgaris. The (R)-2-hydroxy-5-methoxy-3-pentenoic acid (ee. > 96%) was further functionalized via epoxidation, or hydroxylation with osmium tetroxide, or bromine addition, with modest to good diastereoselectivity, leading to 5-methoxy-pentono-1,4-lactones of the series (L)-arabino, (D)-ribo, (L)-lyxo, and (D)-xylo. A new way to obtain 2-oxo-3-enoic acids is described, using Pd mediated cross coupling between vinyl tin compounds and oxalyl chloride monoesters.
引用
收藏
页码:9695 / 9706
页数:12
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