Transition Metal-Catalyzed Intermolecular [5+2] and [5+2+1] Cycloadditions of Allenes and Vinylcyclopropanes
作者:Hermann A. Wegner、Armin de Meijere、Paul A. Wender
DOI:10.1021/ja043671w
日期:2005.5.1
Initial examples of the intermolecular Rh(I)-catalyzed [5+2] cycloaddition reaction of bifunctional allenes and vinylcyclopropanes are described. The reactions proceed with facility and in yields of up to 99% with a variety of alkyne-, ester-, styrene-, or cyano-substituents on the allene to afford the corresponding cycloadducts. In the presence of CO, the reaction proceeds to an eight-membered ring cycloadduct
描述了分子间 Rh(I) 催化的双官能丙二烯和乙烯基环丙烷的 [5+2] 环加成反应的初始实例。反应在丙二烯上以各种炔烃、酯、苯乙烯或氰基取代基进行,产率高达 99%,以提供相应的环加合物。在 CO 存在下,反应进行到八元环环加合物及其跨环闭合产物,提供了与丙二烯的三组分 [5+2+1] 环加成的第一个例子。
Palladium(O)-promoted synthesis of functionally substituted allenes by means of organozinc compounds