1,5-Dipolar Electrocyclizations of Thiocarbonyl Ylides Bearing C=N Groups: Reactions of N -[(Dimethylamino)methylene]thiobenzamide and 2-(Dimethylhydrazono)-1-phenylethanethione with Diazo Compounds


The reactions of thiobenzamide 8 with diazo compounds proceeded via reactive thiocarbonyl ylides as intermediates, which underwent either a 1,5-dipolar electrocyclization to give the corresponding five-membered heterocycles, i.e., 4-amino-4,5-dihydro-1,3-thiazole derivatives (i.e., 10a, 10b, 10c, cis-10d, and trans-10d) or a 1,3-dipolar electrocyclization… (More)


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