Synthesis of pyrrole-dihydrothiazole ensembles from 1-allenyl-1H-pyrrole, isothiocyanates, and propargyl bromide

N-Alkylidene-1-(propargylsulfanyl)-2-(1H-pyrrol-1-yl)buta-1,3-dien-1-amines at treatment by a superbasic system t-BuONa–THF–DMSO under standard conditions of the synthesis of seven-membered azaheterocycles are chemo- and stereoselectively converted into 4,4-disubstituted 5-ethenylidene-2-[(Z)-1-(1H-pyrrol-1-yl)prop-1-enyl]-4,5-dihydro-1,3-thiazoles.