Specific Synthesis of 1,2- and 1,3-Dialkylidenecycloheptanes by [3+2+2] Cyclization of Alkenyl Fischer Carbene Complexes and Allenes
作者:José Barluenga、Rubén Vicente、Pablo Barrio、Luis A. López、Miguel Tomás、Javier Borge
DOI:10.1021/ja045459y
日期:2004.11.1
1,2- and 1,3-dialkylidenecycloheptane rings are specifically assembled from chromium alkenyl Fischer carbene complexes and allenes via [3+2+2] cyclization reactions. The former cycloadducts are obtained when the cyclization is performed in the presence of 1 equiv of [Ni(cod)2], while the [Rh(cod)Cl]2-catalyzed cyclization leads to the latter cycloadducts.
1,2- 和 1,3- 二亚烷基环庚烷环是由铬烯基 Fischer 卡宾配合物和丙二烯通过 [3+2+2] 环化反应组装而成的。当在 1 当量 [Ni(cod)2] 存在下进行环化时,会获得前一种环加合物,而 [Rh(cod)Cl]2 催化的环化会产生后一种环加合物。