A facile chemoenzymatic route to enantiomerically pure 4,5-disubstituted-2-hexenoate derivatives.
作者:Hiroyuki AKITA、Isao UMEZAWA、Michika TAKANO、Hiroko MATSUKURA、Takeshi OISHI
DOI:10.1248/cpb.39.3094
日期:——
The reaction of 4, 5-epoxy-2-hexenoate 2__- and various nucleophiles in the presenece of BF3.Et20 predominantly gave the (4, 5)-5-hydroxy-4-substituted compounds. Among them, (±)-(4, 5)-anti-5-hydroxy-4-thiophenoxy ester 17 was enantioselectively esterified with acylating reagent in the presence of lipase "PL 266" from Alcaligenes sp. to provide the (4S, 5R)-5-acetoxy ester 20 and the (4R, 5S)-17 quantitatively.
在BF3.Et20存在下,4,5-环氧-2-己烯酸酯与各种亲核试剂反应主要生成(4,5)-5-羟基-4-取代化合物。其中,(±)-(4,5)-反式-5-羟基-4-噻吩氧基酯17在Alcaligenes sp.来源的脂肪酶"PL 266"存在下与酰化试剂进行对映选择性酯化反应,定量地生成(4S,5R)-5-乙酰氧基酯20和(4R,5S)-17。