A revision of the synthesis of some polycyclic systems related to benzoheteroquinolizidines

Abstract

The preparation of 3‐methoxycarbonyl‐N‐2‐(3‐benzo[b]thienyl)ethylpyridinium bromide, 5‐methoxy‐carbonyl‐N‐2‐(3‐benzo[b]thienyl)ethyl‐1,2,3,4‐ tetrahydropyridine and (1RS,12bRS)‐1‐methoxycarbonyl(benzo‐[b]thienyl[2,3‐a]quinolizidine is described. Some observations dealing with different methods discussed in the literature for the synthesis of such polycyclic systems are reported.