Syntheses of functionalized thieno[3,4-d]imidazoles and thieno[3,2-d]pyrimidines from chlorine-containing enamidonitriles
摘要:
Enamidonitriles of the general formula Cl(X)C=C(CN)NHCOR readily react with methyl sulfanylacetate to give tri- or tetra-substituted thiophenes, which can be converted into new functional derivatives of thieno[3,2-d]pyrimidine and thieno[3,4-d]imidazole.
2-Acylamino-3-chloroacrylonitriles, Promising Reagents for Heterocyclization
摘要:
2-Acylamino-3-chloroacrylonitriles prepared by treating available N-(1,2,2-trichloroethyl)am ides of carboxylic acids with sodium cyanide readily undergo cyclization in the presence of excess hydrazine hydrate. The cyclization products, 5-amino-4-acylaminopyrazoles, were applied to the synthesis of new imidazo[4,5-c]pyrazole and pyrazolo[1.5 0]pyrimidine derivatives.