Scope. Having finished the synthesis of pyrazole 2, we wondered if reagent 1 could be used to assemble other MeSO2-substituted heterocycles. First, we tried various N,N-bisnucleophiles. Reaction with methyl hydrazine and functionalized aromatic hydrazines cleanly gave the corresponding pyrazoles 8-12 in 48-90% yield (Scheme 2). Reaction with guanidine, urea and thiourea led to the formation of pyrimidines 13-15 in 54-95% yield. Reaction with S-methyl thiourea, however, gave instead of the expected product 16, the dimethylamino derivative 17. The latter must have been formed via the initial formation of compound 16 and the subsequent SNAr-reaction with dimethylamine present in the reaction mixture. Reaction with substituted amidines gave pyrimidines 18-21 in 94-96% yield. Reaction of 1 with 2-chloroacetamide in pyridine gave instead of the expected product 22, the corresponding pyridinium salt 23. Cyclization of 1 with various amino NH-heterocycles produced bicyclic products 24-30.