Abstract
An efficient parallel synthesis of 6,7-dimethoxytetrahydroisoquinolines is reported. The key reaction step is 3,4-dimethoxyphenethylimines reacting with acid chlorides to form an N-acyliminium ion intermediate, which undergoes Pictet-Spengler condensation to give the desired products in > 80 yield. Both solution-phase and solid-phase synthesis of 6,7-dimethoxytetrahydroisoquinolines are described.
Keywords: Tetrahydro-isoquinolines, Pictet-Spengler Reaction, bischler-napieralski reaction