Tandem cycloaddition–rearrangement of 2-aza-1,3-dienes. A simple and efficient synthesis of 1H-1,4-diazepine-7(6H)-thiones
Abstract
1H-1,4-Diazepine-7(6H)-thiones 7 have been synthesized in two steps from 2-aza-1,3-dienes 2 and trimethylsilyl isothiocyanate via 1,2-dihydropyrimidine-4(3H)-thiones 6.