An Efficient Derivation of the Versatile Chiron Antipode 1-<i>tert</i>-Butyldimethylsilylpenta-1,4-diyn-3-ol: Application to the Synthesis of (15<i>E</i>,<i>R</i>,<i>R</i>)-Duryne
作者:A. Sharma、S. Chattopadhyay
DOI:10.1021/jo9800513
日期:1998.9.1
nta-1,4-diyn-3-ol (5), an essential segment of various bioactive polyacetylenic alcohols, has been efficiently resolved via a lipase-catalyzed acylation strategy. Lipases from different Pseudomonas species and Candida rugosa (CRL) furnished its (S)-antipode (as esters) with 86-96% ee. However, the (R)-alcohol 5 could be prepared with acceptable enantiomeric purity (93% ee) only using CRL-vinyl acetate-diisopropyl
标题chiron,1-叔丁基二甲基甲硅烷基戊-1,4-diyn-3-ol(5),是各种生物活性聚乙炔醇的重要组成部分,已通过脂肪酶催化的酰化策略得到了有效解决。来自不同假单胞菌种和皱纹假丝酵母(CRL)的脂肪酶为其(S)-正肽(作为酯)提供了86-96%ee。但是,仅使用CRL-乙酸乙烯酯-二异丙醚作为试剂方案并在双重过滤条件下,才能以可接受的对映体纯度(93%ee)制备(R)-醇5。然后通过其吡喃基化,所需的非手性C(20)-α,ω-二溴化物15的烷基化作用和适当的官能化,将Chiron醇扩展至目标化合物(15E,R,R)-Duryne(I)。