Photocyclization reactions. Part 8 [1]. Synthesis of 2-quinolone, quinoline and cournarin derivatives using trans-cis isomerization by photoreaction

2-Quinolone 2, quinoline 3, coumarin (2H-1-benzopyran-2-one) 5, and 2H-1-benzopyran hemiacetal 6 were synthesized by photocyclization reaction of trans-o-arninocinnamoyl derivatives trans-1 and trans-o-hydroxycinnamoyl derivatives trans-4. The reaction proceeds through trans-cis isomerization followed by intramolecular cyclization.