Selective tandem enyne metathesis for the synthesis of functionalized cycloheptadienes
作者:Steven T. Diver、Daniel A. Clark、Amol A. Kulkarni
DOI:10.1016/j.tet.2008.03.027
日期:2008.7
explained on the basis of a selective ring opening by the second generation Grubbs' ruthenium carbene complex. The ring opening of substituted cyclopentenes and cyclopentene contained in a bicyclic ring system was also achieved. The ring expansion of bicyclic dienes provided seven-membered dienes contained in the bicyclo[5.2.0]nonane ring system. Details of the structural analysis are also discussed. A mechanistic
二烯的区域和部位选择性环膨胀以及取代的环戊烯的区域选择性环膨胀在不含亚甲基的条件下通过烯炔复分解提供1,3-环庚二烯。位点选择性是由二烯反应物中两种不同环烯烃之间的不同环应变引起的。在第二代Grubbs钌卡宾络合物的选择性开环的基础上,解释了在四氢茚(THI)扩环中发现的高区域选择性。还实现了双环体系中包含的取代的环戊烯和环戊烯的开环。双环二烯的环膨胀提供了双环[5.2.0]壬烷环系统中包含的七元二烯。还讨论了结构分析的详细信息。