Novel synthesis of 2,4-diarylquinolines by photochemical followed by thermal transformations of 1,4,6-triarylpyrimidin-2(1H)-ones

Abstract

The 2,4-diarylquinolines (3) were obtained in a one-pot synthesis by photochemical and subsequent thermal reactions of 1,4,6-triarylpyrimidin-2(1H)-ones (1) in fair yield. The quinolines (3) were formed via thermal cycloreversion, followed by electrocyclic ring-closure, of the 1,3-diazabicyclo[2.2.0]hex-5-en-2-ones (2), which were produced by photochemical electrocyclization of the pyrimidin-2(1H)-ones (1).