A dealkylative addition of trialkylamines to dialkyl acetylenedicarboxylates with eosin Y as a metal-free catalyst and molecular oxygen as the terminal oxidant was developed. This visible-light-mediated organocatalytic protocol is compatible with a wide variety of trialkylamines, giving the corresponding adducts in moderate to good yields.
开发了以伊红 Y 作为无金属催化剂和分子氧作为末端氧化剂的三烷基胺与乙炔二羧酸二烷基酯的脱烷基加成反应。这种可见光介导的有机催化方案与多种三烷基胺兼容,以中等至良好的产率提供相应的加合物。
An efficient dealkylative addition of trialkylamines to dialkyl acetylenedicarboxylates in the presence of a metallic chloride
作者:Chan Sik Cho
DOI:10.1016/j.tetlet.2005.01.034
日期:2005.2
Dialkyl acetylenedicarboxylates react effectively with an array of trialkylamines in dioxane at 80degreesC in the presence of a metallic chloride to afford the corresponding aminomaleates in good yields. (C) 2005 Elsevier Ltd. All rights reserved.
Efficient oxidative N -dealkylative addition of trialkylamines to dimethyl acetylenedicarboxylate using BrCCl 3 as the terminal oxidant
Herein we present a continuous improvement of visible-lightmediated N-dealkylative addition of tertiary amines to dimethyl acetylenedicarboxylates (DMAD) using alkyl halogenides as external oxidants together with base additives. This method is highlighted by excellent tolerance with various tertiary amines and good to excellent yields in short reaction time under mild conditions.