Synthesis of 5-Thioxo-hexahydrobenzo[<i>b</i>]thiopheno[2,3-<i>d</i>]-1,2,4-triazolo[1,5-<i>c</i>]pyrimidines and Related Compounds Based on Cyclocondensations of 2-Isothiocyanato-3-cyano-4,5,6,7-tetrahydrobenzo[<i>b</i>]thiophene
5-Thioxo-4,6,8,9,10,11-hexahydro-benzo[b]thiopheno[2,3-d]-1,2,4-triazolo[1,5-c]pyrimidines and relatedcompounds were prepared based on cyclizations of 2-isothiocyanato-3-cyano-4,5,6,7-tetrahydrobenzo[b]thiophene with aminoketones and carboxylic hydrazides.