Author's Organization:Faculty of Pharmaceutical Sciences, Kanazawa University:(Present address)Eisai Co., Ltd. Pharmaceutical Institute, Tohoku University
1, 2-Dihydrocyclobut [c] isoquinoline was synthesized through photochemical 2+2 cycloaddition of 3-methoxyisoquinolin-1 (2H)-one to 1, 1-dichloroethylene.