Chiron based synthesis of isocoumarins: reactivity of α-substituted carboxylic acids
作者:Aisha Saddiqa、Abdul R. Raza、David StC. Black、Naresh Kumar
DOI:10.1016/j.tetasy.2014.03.019
日期:2014.5
The asymmetric synthesis of a novel (S)-isocoumarin has been attempted in a single step by the coupling of homophthalic acid with (S)-N-protected amino acids and alpha-chloroacids at high temperature by exploiting a chiral pool methodology. The coupling of homophthalic acid with N-protected (S)-amino acids gave exclusion of the carboxyl/alkyl group. However, coupling of homophthalic acid with alpha-chloro-acids afforded asymmetric isocoumarins in high yield. (C) 2014 Elsevier Ltd. All rights reserved.
Mn(OAc)<sub>3</sub>-Mediated Hydrotrifluoromethylation of Unactivated Alkenes Using CF<sub>3</sub>SO<sub>2</sub>Na as the Trifluoromethyl Source
作者:Bin Cui、Hui Sun、Yibo Xu、Lin Li、Lili Duan、Yue-Ming Li
DOI:10.1021/acs.joc.8b00633
日期:2018.6.1
A simple and efficient method for hydrotrifluoromethylation of unactivated alkenes was reported. The reaction relied on the single electron oxidation of a commercially available sodiumtrifluoromethanesulfinate (CF3SO2Na, Langlois’ reagent) using Mn(OAc)3·2H2O as the oxidant and the subsequent addition of trifluoromethyl radical to C═C double bonds. The reaction proceeded readily under mild conditions
报道了一种简单有效的未活化烯烃加氢三氟甲基化的方法。该反应依赖于使用Mn(OAc)3 ·2H 2 O作为氧化剂的市售三氟甲烷亚磺酸钠(CF 3 SO 2 Na,Langlois试剂)的单电子氧化,随后将三氟甲基自由基加到C═Cdouble债券。反应在温和条件下容易进行,并且对底物中的各种官能团具有良好的耐受性。通过氘化,自由基钟和TEMPO抑制实验研究了初步反应机理。