Thiocyanation of Enamines of the 3,3-Dialkyl-1,2,3,4-tetrahydroisoquinoline Series

Abstract

Thiocyanation of secondary enamines of the 3,3-dialkyl-1,2,3,4-tetrahydroisoquinoline series and their benzo[f]-fused analogs (esters, amides, ketones, and nitriles) with thiocyanogen generated in situ afforded thiazolo[4,3-a]isoquinoline derivatives. Analogous reaction with a tertiary enamino ketone gave product of hydrogen substitution at the β-carbon atom of the enamine fragment.