Diverse Reactivity of Zirconacyclocumulenes Derived from Coupling of Benzynezirconocenes with 1,3-Butadiynes towards Acyl Cyanides: Synthesis of Indeno[2,1-<i>b</i>]pyrroles or [3]Cumulenones
作者:Xiaoping Fu、Jingjin Chen、Guangyu Li、Yuanhong Liu
DOI:10.1002/anie.200900951
日期:2009.7.13
Versatility: Cycloaddition of carbamoyl cyanides to 1,3‐butadiynes via seven‐membered zirconacyclocumulenes yields dihydroindeno[2,1‐b]pyrroles (see scheme, right); a C(sp2)H bond on the aromatic substituent of the 1,3‐butadiyne reactant is activated in the process. In contrast, reactions with aryl or alkyl acylcyanides provide a stereoselective route to cis‐[3]cumulenones (left).
通用性:氨基甲酰氰经七元氧化锆环枯烯环加成成1,3-丁二炔产生二氢茚并[2,1- b ]吡咯(见方案右)。一个C(SP 2) H于1,3-丁二炔反应物的芳族取代基键在该过程中被激活。相反,与芳基或烷基酰基氰的反应提供了到顺式[[3]]枯烯酮的立体选择路线(左)。