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-
已经研究了4-羟基-5-氧亚氨基-3-噻吩羧酸盐与肼和取代的肼的反应。已经显示反应的产物是吡唑-3-或5-硫代异羟肟酸,而不是贝纳利和席尔伯斯特伦先前描述的。提出了两种替代机制来解释区域化学结果。吡唑-3-和5-硫代异羟肟酸的结构以及相应的腈已通过独立合成,与已知化合物进行比较以及质子和碳磁共振以及远距离HETCOR实验得到了证明。