Study of the Diastereoselectivity of Cobalt-Mediated [2+2+2] Cycloadditions of Substituted Linear Enediyne Esters
作者:Franck Slowinski、Corinne Aubert、Max Malacria
DOI:10.1002/1099-0690(200109)2001:18<3491::aid-ejoc3491>3.0.co;2-3
日期:2001.9
preparation of substituted linear enediyne esters bearing the double bond either at the terminal or at internal position and the ester substituent either at the alkyne or at the alkene terminus is presented. Their cobalt(I)-mediated [2+2+2] cyclizations produce the η4-complexed tricyclic compounds in very good yields. The endo/exo selectivity depends on the position of the ester in the enediyne, but the
介绍了在末端或内部位置带有双键并且在炔烃或烯烃末端带有酯取代基的取代的线性烯二炔酯的制备。它们的钴 (I) 介导的 [2+2+2] 环化以非常好的产率产生了 η4 络合的三环化合物。内/外选择性取决于酯在烯二炔中的位置,但环化可以是完全非对映选择性的。研究了带有手性酯的烯二炔环化过程中的不对称诱导;然而,非对映体过量是低的。