作者:Norton P. Peet、Shyam Sunder
DOI:10.1002/jhet.5570120620
日期:1975.12
hydroxide yielded hydrazones rather than thiadiazoles. The reaction of α-[(ethoxycarbonyl)hydrazono]benzenepropanoic acid (25) with thionyl chloride yielded 5-phenyl-1,2,3-thiadiazole-4-carbocylic acid (26a), the corresponding acid chloride 26b, and 5-(phenylmethyl)-2H-1,3,4-oxadiazine-2,6(3H)dione (27). The yields of 26a, 26b, and 27 were dependent on the reaction conditions employed. Oxadiazine 27 could also
探索了几种用于制备某些4,5-二取代-1,2,3-噻二唑的方法。苯氧基乙酰氯与重氮乙酰酰胺的反应产生了α-重氮-β-酮乙酰胺,将其与硫化氢和氢氧化铵环合成4-甲酰胺基-5-苯氧基甲基-1,2,3-噻二唑。然而,用硫化氢和氢氧化铵处理α-重氮-α-苯甲酰基乙酰胺会产生,而不是噻二唑。α-[(乙氧羰基)肼基]苯丙酸(25)与亚硫酰氯反应生成5-苯基-1,2,3-噻二唑-4-碳氢酸(26a),相应的酰氯26b和5-(苯甲基)-2 H -1,3,4-恶二嗪-2,6(3 H)二酮(27)。26a,26b和27的产率取决于所采用的反应条件。恶二嗪27也可以与亚硫酰氯转化为酰氯26b。用乙硼烷还原1-([5-(4-氯苯氧基)甲基-1,2,3-噻二唑-4-基]-羰基)哌啶(10b),得到硼配合物,产生1-([5-((从乙醇中重结晶后得到4-氯苯氧基)甲基)-1,2,3-噻二唑-4-基]甲基)哌啶(31)。