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.
Die Kondensationsreaktion von Bromethyl‐benzothiophen (I) mit 3‐Methoxycarbonylpyridin zu (II) sowie Hydrierung und Cyclisierung zu (III) bzw. (IV) werden an verschiedenen Pyridin‐Derivaten erneut untersucht und teilweise korrigiert.
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