Photolysis of the 2-Azabicyclo [4. 1. 0] heptane-3, 5-dione System

Abstract

Irradiation of 2-alkyl-4, 4-dimethyl-2-azabicyclo [4. 1. 0] heptane-3, 5-dione (3), prepared by the reaction of 2, 4-dioxo-N-alkyl-3, 3-dimethyltetrahydropyridine (1) with sulfonium ylid, gave 1-alkyl-3, 3-dimethyl-1H-azepine-2, 4 (3H, 5H)-dione (4) with a ring expansion.