Highly enantioenriched 4-alken-1-yn-3-ol moiety (1), present in many bioactive acetylenic metabolites from sponges, has been efficiently obtained by reduction of the parent 1-trimethyl-silyl-4-alken-1-yn-3-one (2) with Alpine-Borane or with BH3 · SMe2 in the presence of chiral oxazaborolidines, followed by desilylation of the resulting alcohol. This strategy has been applied to the first stereoselective synthesis of petrofuran 3.
高度对映体富集的 4-alken-1-yn-3-ol 部分 (1) 存在于海绵的许多
生物活性炔属代谢物中,通过还原母体 1-三甲基-甲
硅烷基-4-alken-1-yn- 可以有效获得在手性
恶唑硼烷存在下,与 Alpine-Borane 或
BH3·SMe2 进行 3-一 (2) 反应,然后对所得醇进行脱甲
硅烷基化。该策略已应用于石油
呋喃3的首次立体选择性合成。