Enantioselective Organocatalytic Reduction of β-Trifluoromethyl Nitroalkenes: An Efficient Strategy for the Synthesis of Chiral β-Trifluoromethyl Amines
作者:Elisabetta Massolo、Maurizio Benaglia、Manuel Orlandi、Sergio Rossi、Giuseppe Celentano
DOI:10.1002/chem.201405730
日期:2015.2.23
β‐trifluoromethyl‐substituted nitroalkenes, mediated by 3,5‐dicarboxylic ester‐dihydropyridines (Hantzsch ester type), has been successfully developed. A multifunctional thiourea‐based (S)‐valine derivative was found to be the catalyst of choice, promoting the reaction in up to 97 % ee. The methodology has been applied to a wide variety of substrates, leading to the formation of differently substituted precursors
已经成功开发了由3,5-二羧酸酯-二氢吡啶(Hantzsch酯型)介导的有效的有机催化立体选择性还原β-三氟甲基取代的硝基烯烃。发现多功能硫脲基(S)-缬氨酸衍生物是选择的催化剂,可促进高达97%ee的反应 。该方法已应用于多种底物,导致形成对映体富集的β-三氟甲基胺的不同取代的前体。通过计算研究了无金属催化物质的反应机理和作用方式。在DFT过渡态(TS)分析的基础上,还提出了立体选择模型。