Regioselective competitive synthesis of 3,5-bis(het) aryl pyrrole-2-carboxylates/carbonitriles vs. β-enaminones from β-thioxoketones
作者:Kothanahally S. Sharath Kumar、Hanumappa Ananda、Shobith Rangappa、Sathees C. Raghavan、Kanchugarakoppal S. Rangappa
DOI:10.1016/j.tetlet.2021.153373
日期:2021.10
easily adaptable protocol for the synthesis of 3,5-bis(het)aryl-2-carboxylate/nitrile pyrroles and the related 2,3,5-tri(het)aryl-pyrroles with complementary regioselectivity from the corresponding 1,3-bis(het)aryl-1,3-monothio diketones or β-enaminone precursors has been reported. Initially, regioselective base catalyzed condensation of glycine ethyl/methyl esters or aminoacetonitrile with 1,3-bis(het)aryl-1
用于合成 3,5-双(杂)芳基-2-羧酸酯/腈吡咯和相关的 2,3,5-三(杂)芳基-吡咯的易于适应的方案,具有来自相应 1,3-的互补区域选择性已经报道了双(杂)芳基-1,3-单硫代二酮或 β-烯胺酮前体。最初,区域选择性碱催化甘氨酸乙酯/甲酯或氨基乙腈与 1,3-双(杂)芳基-1,3-单硫代二酮缩合得到 β-烯胺酮,然后原位环化形成 3,5-双(het)芳基-2-羧酸酯/腈吡咯。完全控制吡咯环上第 3 和第 5 位的 2,3,5 三取代吡咯的合成是该协议的显着特点。尽管产品产率中等至良好,但该方法提供了一种轻松的区域选择性进入 2,3,