Organocatalytic formal [2+2] cycloaddition initiated by vinylogous Friedel–Crafts alkylation: enantioselective synthesis of substituted cyclobutane derivatives

Guo-Jian Duan, Jun-Bing Ling, Wei-Ping Wang, Yong-Chun Luo and Peng-Fei Xu*

https:// doi: 10.1039/c3cc41785a