Thieno[b]quinolizidines were synthesized by reduction of thieno[b]quinolizidinones and the stereochemistry of their methiodide derivatives was studied. Hofmann degradation of the latter led to thienoazecines.
Marchalin, Stefan; Decroix, Bernard, Journal of Heterocyclic Chemistry, 1994, vol. 31, # 2, p. 495 - 500