The reactions of 3,6-disubstituted and azoloannulated 1,2,4,5-tetrazines containing heterocyclic leaving groups with S-nucleophiles were studied. The methods of introduction of functionalized thiols, including thiol derivatives of 1,7- and 1,2-dicarba-closo-dodecaboranes, into the tetrazine ring were developed. It was established for the first time that, instead of replacement of a leaving group in the tetrazine ring, the attack of S-nucleophile at the unsubstituted carbon atom occurs in the case of imidazo[1,2-b][1,2,4,5]tetrazines to form previously unknown products of nucleophilic substitution of the hydrogen atom.
研究了含有杂环离去基团的3,6-二取代和含氮唑并环的
1,2,4,5-四嗪与S-亲核试剂的反应。开发了将功能化
硫醇(包括1,7-和1,2-二碳
硼烷硫醇衍
生物)引入四嗪环的方法。首次证实,在
咪唑并[1,2-b][1,2,4,5]四嗪的情况下,S-亲核试剂不是取代四嗪环中的离去基团,而是攻击未取代的碳原子,形成先前未知的氢原子亲核取代产物。