Photochemical reductive dimerization of quinoxalin-2-ones and 1,4-benzoxazin-2-one
Abstract
Irradiation of the quinoxalin-2-ones (1a—d) in the presence of amine gave the quinoxalin-2-one reductive dimers (2a—d), while irradiation of the 1,4-benzoxazin-2-one (4) under similar conditions gave two stereoisomeric reductive dimers [(5a) and (5b)].