The SmI2-mediated reductive coupling between alkynyloxiranes and ketones provides a new route to 2,3-pentadiene-1,5-diols. The preferred stereochemistry observed in the coupling products is the result of the new CC bond forming anti with respect to the opening epoxide ring. Yields and diastereoselectivities are dependent on the alkynyloxirane substitution pattern.
SmI 2介导的炔基
肟基和酮之间的还原偶联为2,3-
戊二烯-1,5
-二醇的合成提供了一条新途径。在偶合产物中观察到的优选的立体
化学是新CC键形成的结果反相对于所述开口
环氧化物环。产率和非对映选择性取决于炔基
环氧乙烷取代模式。