Catalyst-free transfer hydrogenation of activated alkenes exploiting isopropanol as the sole and traceless reductant
作者:Tamal Kanti Das、Agustin M. Rodriguez Treviño、Sanjay Pandiri、Sini Irvankoski、Juha H. Siitonen、Sara M. Rodriguez、Muhammed Yousufuddin、László Kürti
DOI:10.1039/d2gc04315g
日期:——
Both metal-catalyzed and organocatalytic transfer hydrogenation reactions are widely employed for the reduction of CO and CN bonds. However, selectivetransfer hydrogenation reactions of CC bonds remain challenging. Therefore, the chemoselective transfer hydrogenation of olefins under mild conditions and in the absence of metal catalysts, using readily available and inexpensive reducing agents (i.e
金属催化和有机催化转移加氢反应都广泛用于还原 C O 和 C N 键。然而,C C 键的选择性转移氢化反应仍然具有挑战性。因此,在温和条件下和在没有金属催化剂的情况下,使用容易获得且廉价的还原剂(即伯醇和仲醇)对烯烃进行化学选择性转移加氢,将标志着绿色转移加氢策略的发展取得了重大进展。本文描述的是活性烯烃的非常规无催化剂转移氢化反应,使用异丙醇作为环保还原剂和溶剂。该反应以中等至良好的收率方便地合成了多种取代的丙二酸半氧酯 (SMAHO)。机理研究指出了一种前所未有的氢键辅助转移氢化过程。
Synthesis of a new urea derivative: a dual-functional organocatalyst for Knoevenagel condensation in water
A phenylalanine-urea compound-catalyzed Knoevenagel condensation in water is reported. Various aldehydes and active methylene compounds undergo condensation at room temperature to give the desired products in high yields. The mechanism of the condensation of aldehydes with Meldrum's acid catalyzed by the novel urea derivative is also disclosed. (C) 2013 Elsevier Ltd. All rights reserved.