FUROPYRIDINES .16. PHOTO[2-[3,2-C]PYRIDIN-4(5H)-ONE WITH ACRYLONITRILE(2] CYCLOADDITION OF FURO)

The photocycloaddition of furo[3,2-c]pyridin-4(SH)-one (1) and its N-m ethyl derivative (1-Me) to acrylonitrile has been studied. The structu res of the photoadducts isolated by column chromatography were determi ned on the basis of the nuclear magnetic resonance spectroscopy. The c ycloaddition of 1 afforded an adduct 2 at the carbonyl. oxygen and fou r possible isomers 3a, 3b, 3c and 3d of cyclobutane-fused adduct at th e 6- and 7-position of 1, and the addition of 1-Me the N-methyl deriva tives 3a-Me, 3b-Me, 3c-Me and 3d-Me.