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 convenient synthesis 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。