Intermolecular [2 + 2] cycloaddition reaction of an allenyl silyl ether with vinyl ethers was realized on the basis of electrophilic activation of the allene by the platinum–phosphine catalyst, affording the corresponding methylenecyclobutanes in good yield. The use of the bulky trialkynylphosphine as a ligand was indispensable to achieve highly selective [2 + 2] cycloaddition.
基于
铂-膦催化剂对烯炔的电亲和激活,成功实现了烯炔
硅醚与
乙烯醚的分子间[2 + 2]环加成反应,获得了相应的
亚甲基环丁烷,产率良好。使用体积较大的三烷基膦作为
配体对于实现高度选择性的[2 + 2]环加成反应是不可或缺的。