N-(3-Benzo[b]thienyl)- and N-(2-benzo[b]thienyl)-imino-triphenylphosphorane—prepared from the corresponding azidobenzo[b]thiophenes—react with α,β-unsaturated aldehydes under mild conditions to give directly benzo-[b]thieno[3,2-b]- and benzo[b]thieno[2,3-b]-pyridines through electrocyclization (and eventual dehydrogenation) of the initial aza Wittig imine products.
由相应的
叠氮苯并[b]
噻吩制备的 N-(3-苯并[b]
噻吩基)-和 N-(2-苯并[b]
噻吩基)-亚
氨基
三苯基膦与 α、β-不饱和醛在温和条件下发生反应,通过电环化(并最终脱氢)最初的氮杂维蒂希
亚胺产物,直接得到苯并[b]
噻吩并[3,2-b]-和苯并[b]
噻吩并[2,3-b]-
吡啶。