Organic Photochemistry. I. 3, 4-Dihydroisoquinolines from Tetrahydroisoquinoline N-Tosylates

Abstract

Photolysis of 1-substituted 6, 7-dimethoxy-1, 2, 3, 4-tetrahydroisoquinoline N-tosylates (Va-d) with high pressure mercury lamps (100W and 400W) in neutral (EtOH) or basic [80% (v/v) EtOH containing Na₂CO₃] media was examined. Under these conditions, 3, 4-dihydro compounds (VIIa-d) were formed in moderate yields.