Non-catalyzed addition of heterocyclic thiols and 5-substituted-1H-tetrazoles to vinyl ethers
作者:Iuliia Melnikova、Jaroslav Roh、Jiří Kuneš、Tatiana Artamonova、Yuri Zevatskii、Leonid Myznikov
DOI:10.1016/j.tetlet.2017.08.058
日期:2017.10
1H-tetrazole-5-thiols and 4-substituted 4 H-1,2,4-triazole-3-thiols with alkyl halides or sulfonates lead to the formation of S-alkylated products regardless of the substituent on the heterocycle. In this work, we found that substituted 1H-tetrazole-5-thiols and 4 H-1,2,4-triazole-3-thiols readily reacted with vinyl ethers in the absence of a catalyst to exclusively form N-substituted 1H-tetrazole-5(4H)-thiones and
与取代基烷基无关的1-取代的1 H-四唑-5-硫醇和4-取代的4 H-1,2,4-三唑-3-硫醇的烷基化导致形成S-烷基化产物在杂环上。在这项工作中,我们发现在没有催化剂的情况下,取代的1 H-四唑-5-硫醇和4 H-1,2,4-三唑-3-硫醇易于与乙烯基醚反应,专门形成N-取代的1 H -四唑-5(4 H)-硫酮和1 H -1,2,4-三唑-5(4 H)-硫酮。此外,5-取代-1 H的反应在相同条件下用乙烯基醚合成-四唑,有选择地产生2,5-二取代的四唑。