Stereochemical Control in Microbial Reduction. 12. (<i>S</i>)-4-Nitro-2-butanol as a Source to Synthesize Natural Products
作者:Kaoru Nakamura、Takashi Kitayama、Yoshihiko Inoue、Atsuyoshi Ohno
DOI:10.1246/bcsj.63.91
日期:1990.1
(S)-(+)-4-Nitro-2-butanol (1) obtained by the stereoselective reduction of 4-nitro-2-butanone by bakers’ yeast was employed for the syntheses of natural products. A precursor of (+)-brefeldin A is synthesized starting from this chiral building block by 10 steps short-cut procedure compared with the shortest method so far reported. (S)-(+)-Sulcatol is obtained in much better enantiomeric purity than those reported. The reactivity of 1 in base-catalyzed condensations with Michael acceptors or aldehydes is largely affected by a base employed as the catalyst.
通过用面包酵母进行立体选择性还原4-硝基-2-丁酮,获得的(S)-(+)-4-硝基-2-丁醇(1)被用于天然产物的合成。以该手性构建块为起始材料,通过10步的简化工艺合成了(+)-布雷菲尔丁A的前体,相较于目前已报道的最短方法,这一工艺大大缩短了步骤。所获得的(S)-(+)-苏卡醇的对映体纯度明显高于已报道的结果。1在与迈克尔受体或醛进行碱催化缩合反应时,其反应性受到所用催化剂的碱的影响。