Novel Method for the Synthesis of Substituted Imidazothiazolones
摘要:
A general and highly selective method for the synthesis of 4-substituted 3a,6a-diphenyltetrahydro-2H-imidazo[4,5-d][1,3]thiazole-2,5(3H)-diones has been developed through a new reaction of 1-substituted 5-hydroxy-4,5-diphenyl-1H-imidazol-2(5H)-nes with potassium thiocyanate in the presence of acetic acid in acetonitrile. Details of supramolecular organization in the crystalline imidazothiazolones, as revealed by X-ray diffraction, are highlighted.
The reaction of 1,4,5-trisubstituted 1H-imidazole-3-oxides 1 with 2,2-bis(trifluoromethyl)ethene-1,1-dicarbonitrile (7, BTF) yielded the corresponding 1,3-dihydro-2H-imidazol-2-ones 10 and 2-(1,3-dihydro-2H-imidazol-2-ylidene)malononitriles 11, respectively, depending on the solvent used. In one example, a 1 : 1 complex, 12, of the 1H-imidazole 3-oxide and hexafluoroacetone hydrate was isolated as