Reaction of 4-hydroxy-5-oximino-3-thiophenecarboxylates with hydrazines. Formation of pyrazolylthiohydroxamic acids
作者:R. L. Robey、C. A. Alt、E. E. Van Meter
DOI:10.1002/jhet.5570340210
日期:1997.3
The reactions of 4-hydroxy-5-oximino-3-thiophenecarboxylates with hydrazine and substituted hydrazines have been investigated. The products of the reactions have been shown to be pyrazole-3- or 5-thiohydroxamic acids rather than the hydrazones previously described by Benary and Silberstrom. Two alternate mechanisms are proposed which account for the regiochemical outcome. The structures of the pyrazole-3-