Photoreactions of 6-(1′-triazolyl)uracils. Synthesis of 7,8-disubstituted pyrrolo[2,3-d]pyrimidines and pyrimido[4,5-c]isoquinolines
摘要:
A series of 6-(1'-triazolyl)uracils 4a-f were subject to photolysis at 254 nm in acetonitrile. The C4', C5'-disubstituted triazoles 4a-c afforded pyrrolo[2,3-d]pyrimidines 5a-c whereas mono-substituted triazoles gave rise to polymeric mixtures. C5'-phenyl substituted adducts 4e,f generated pyrimido[4,5-c]isoquinolines 7 and 8 via a novel photorearrangement process.