A convenient eco-friendly system for the synthesis of 5-sulfenyl tetrazole derivatives of indoles and pyrroles employing CeCl<sub>3</sub>·7H<sub>2</sub>O in PEG-400
作者:Margiani P. Fortes、Mariana M. Bassaco、Teodoro S. Kaufman、Claudio C. Silveira
DOI:10.1039/c4ra05625f
日期:——
efficient and eco-friendly promoter system for the convenientsynthesis of 5-sulfenyl tetrazoles derived from indoles and pyrroles, is reported. The synthesis entails the [3 + 2] cycloaddition reaction of NaN3 with 3-thiocyanato indoles (including 3,3′-di-thiocyanato-1H,1H′,2,2′-biindoles) and 2-thiocyanato pyrroles. The thiocyanates were conveniently obtained by the oxone-mediated thiocyanation of differently
据报道,在聚乙二醇400(PEG-400)中使用CeCl 3 ·7H 2 O作为有效和环保的促进剂体系,可方便地合成由吲哚和吡咯衍生的5-亚磺酰基四唑。合成需要使NaN 3与3-硫代氰基吲哚(包括3,3'-二硫代氰基-1 H,1 H ',2,2'-双吲哚)和2-硫代氰基吡咯进行[3 + 2]环加成反应。硫氰酸盐可通过不同取代的起始吲哚,1 H,1 H ',2,2'-双吲哚和N-芳基吡咯与NH 4的异丁酮介导的硫氰酸氰化反应方便地获得SCN。还研究了转换的范围和局限性。
Facile, efficient and eco-friendly synthesis of 5-sulfenyl tetrazole derivatives of indoles and pyrroles
作者:Bruna L. Kuhn、Margiani P. Fortes、Teodoro S. Kaufman、Claudio C. Silveira
DOI:10.1016/j.tetlet.2014.01.101
日期:2014.2
A concise, two-step eco-friendly approach towards the synthesis of 5-sulfenyl tetrazole derivatives of indoles and pyrroles, is reported. The synthesis comprises the oxone-mediated thiocyanation of the starting heterocycles towards intermediate 3-thiocyanato indoles and 2-thiocyanato pyrroles, and their subsequent treatment with sodium azide in 2-propanol/water under zinc bromide promotion.
Fe<sub>3</sub>O<sub>4</sub>-Graphene oxide nanocomposite: Synthesis of 5-sulfanyl tetrazole derivatives of alkyls, indoles, and pyrroles
作者:Mahrokh Baghershiroudi、Kazem D. Safa
DOI:10.1080/00397911.2018.1519077
日期:2018.11.17
this work, the use of Fe3O4/geraphene oxide nanocomposite as an efficient catalyst for the synthesis of 5-sulfanyltetrazole derivatives of indoles, pyrroles, and 5-alkyl sulfanyltetrazoles is described. These compounds are readily obtained by the reaction of the starting heterocycles indoles, N-aryl pyrroles, alkyl thiocyanates, and trimethylsilyl azide in good to excellent yields. Moreover, Fe3O4/GO