β,β,β‐Trichloroethyl‐
<i>N</i>
H‐Enamine as Viable System for 5‐
<i>Endo‐trig</i>
Radical Cyclization
<i>via</i>
Multifaceted Cu
<sup>I</sup>
−Cu
<sup>II</sup>
Redox Catalysis: Single Step Synthesis of Multi‐Functionalized
<i>N</i>
H‐Pyrroles
作者:Ram N. Ram、Sandhya Sadanandan、Dharmendra Kumar Gupta
DOI:10.1002/adsc.201900938
日期:2019.12.17
NH‐enamine systems via multifaceted CuI−CuII redox catalysis generating radicals, preventing dehalogenative reduction of radical precursors and dehydrohalogenating the 5‐endo‐trig cyclized products have been demonstrated experimentally. With wider substrate scope, this method incorporates halo‐, NH‐ and carbonyl functionalities besides alkyl, aryl and heteroaryl substituents in the pyrrole unit easily
在此我们报告了通过新颖的5-内-trig自由基环化模式从多种β,β,β-三氯乙基-N H-烯胺中高收率的轻度和区域选择性铜催化直接合成多取代和官能化N H-吡咯的方法。,以前在烯胺体系中不可行。几何“不受欢迎到青睐”的方法来变换5-内-TRIG在自由基环化模式ñ H-烯胺系统通过多方面的Cu我-Cu II氧化还原催化产生自由基,防止自由基前体的还原dehalogenative和脱卤化氢的5-内切触发已通过实验证明了环化产物。具有更宽底物范围,这种方法结合了卤素- ,Ñ H-和羰基官能除了在吡咯单元烷基,芳基和杂芳基的取代基容易。这些难以制备的3-卤代N H-吡咯是天然产物,农用化学品,药物和有机金属化学的潜在来源。