Regiodivergent heterocyclization: a strategy for the synthesis of substituted pyrroles and furans using α-formyl ketene dithioacetals as common precursors
作者:Ting Wu、Ling Pan、Xianxiu Xu、Qun Liu
DOI:10.1039/c3cc48546c
日期:——
challenging task. We report here that 5-alkylthio-pyrroles, 4-alkylthiocarbonyl-pyrroles and 2-alkylthio-4-tosyl-furans can be prepared, selectively, in a single operation using the readily available alpha-formyl ketene dithioacetals as common precursors, through their regiodivergent heterocyclization with alpha-acidic isocyanides controlled by the choice of suitable catalysts/promoters.
从常见的起始材料中选择性地构建五元芳族杂环的各种阵列是一项有吸引力且具有挑战性的任务。我们在这里报告说,可以使用易于获得的α-甲酰基烯酮二硫缩醛作为普通前体,通过一次操作,选择性地在一次操作中选择性地制备5-烷硫基吡咯,4-烷硫基羰基吡咯和2-烷硫基-4-甲苯基呋喃通过选择合适的催化剂/助催化剂来控制α-酸性异氰酸酯的区域发散性杂环化。