Synthesis of 2-pyrolyl-2-hydroxy-2-cyanoacetamide through FeCl3–TBHP mediated hydroxylation of captodative stabilized radical intermediate
作者:Subhendu Maity、Animesh Pramanik
DOI:10.1016/j.tetlet.2014.08.074
日期:2014.10
using tert-butyl hydroperoxide as oxidant and ferric chloride as radical initiator. In this reaction the tert-butyl oxo radical abstracts hydrogen from the active methylene group of 2-pyrolyl-2-cyanoacetamides to generate a stable captodativeradical intermediate. Then recombination of this radical intermediate with tert-butyl oxo radical followed by acid catalysed thermal elimination of the tert-butyl
通过选择性的C H氧化,合成了一系列2-羟基-2-(4-氧代-1,2-二芳基-4,5,6,7-四氢-1 H -3-吲哚基)-2-氰基乙酰胺。氰基乙酰胺衍生物的活性亚甲基碳,以叔丁基过氧化氢为氧化剂,氯化铁为自由基引发剂。在该反应中,叔丁基氧代自由基从2-吡咯基-2-氰基乙酰胺的活性亚甲基中提取氢,以生成稳定的capddative自由基中间体。然后,该自由基中间体与叔丁基氧代自由基重组,然后经酸催化热消除叔丁基,以高收率得到季羟基氰基乙酰胺衍生物。