THE FIRST EXAMPLE OF 4,7,8,9-TETRAHYDROTHIENO- (2,3-d)AZOCINE SYNTHESIS BY DOMINO REACTION OF 4-ARYL-4,5,6,7-TETRAHYDROTHIENO(3,2-c)PYRIDINES WITH ACTIVATED ALKYNES

It is shown that the expansion of the tetrahydropyridine fragment requires the presence of an aryl substituent at position 4 of the tetrahydrothieno[3,2-c]pyridines as it stabilizes the intermediate acyclic zwitterion.