Preparation of 5-Alkylthio and 5-Arylthiotetrazoles from Thiocyanates Using Phase Transfer Catalysis
作者:Blaise W. LeBlanc、Branko S. Jursic
DOI:10.1080/00397919808004905
日期:1998.10
efficient method of preparation for 5-alkyl and 5-arylthiotetrazoles from the corresponding alkyl or aryl halides is described. The halides are first transformed into thiocyanates which further react with azide, yielding the corresponding tetrazoles with [2+3] polar cycloaddition. All synthetic transformations are performed under phase transfer catalytic conditions. The yields vary from good to excellent
摘要 描述了一种从相应的烷基或芳基卤化物制备 5- 烷基和 5- 芳基硫代四唑的非常有效的方法。卤化物首先转化为硫氰酸盐,硫氰酸盐进一步与叠氮化物反应,通过 [2+3] 极性环加成生成相应的四唑。所有合成转化均在相转移催化条件下进行。除了制备 5-苄基硫代四唑外,产率从良好到极好不等,其中硫氰酸苄酯与叠氮化物 [2+3] 环加成之间的反应与亲核取代竞争,以苄基叠氮化物作为产物。