Organocatalytic Cyclization of COS and Propargylic Derivatives to Value‐Added Heterocyclic Compounds
作者:Hui Zhou、Rui Zhang、Sen Mu、Hui Zhang、Xiao‐Bing Lu
DOI:10.1002/cctc.201900490
日期:2019.12.5
and 1,3‐thiazolidine‐2,4‐diones derivatives in a highly chemo‐ and stereoselective manner. The isotope labeling and stoichiometric experiments suggested the LB‐COS adducts preferentially mediated basic ionic pair mechanism. Furthermore, the practical application of this methodology was highlighted by the highlyefficientsynthesis of rosiglitazone using COS as sulfur source.
The base-promoted cyclization of internal N-propargyl-malonamides in the presence of carbonate bases at room temperature or at 80 °C affords highly substituted 3-pyrrolin-2-ones in good yields.
在碳酸盐碱存在下,在室温或 80 °C 下,碱促进的内部 N-炔丙基-丙二酰胺环化以良好的收率提供了高度取代的 3-吡咯啉-2-酮。
The Reaction of Acetylenic Amines with Tetraethylammonium Carbonate and Hydrogen Carbonate; Synthesis of 5-Methylene-1,3-oxazolidin-2-ones
The reaction of acetylenic amines 1 with electrochemically generated tetraethylammonium carbonate (TEAC) or chemically generated tetraethylammonium hydrogen carbonate (TEAHC) is reported. Unsubstituted or substituted 5-methylene-1,3-oxazolidin-2-ones 2 are obtained in moderate to very high yields according to the reaction conditions adopted and to the nature of the substrate.
Robust Silver(I) Catalyst for the Carboxylative Cyclization of Propargylic Alcohols with Carbon Dioxide under Ambient Conditions
作者:Qing-Wen Song、Liang-Nian He
DOI:10.1002/adsc.201500639
日期:2016.4.14
date for this conversion, with a very high turnover number of up to 6024, probably due to the synergistic effect of Lewis basic and Lewis acidic species for the activation of both propargylic alcohol and carbon dioxide by the formation of the alkyl carbonate with a bulkier counterion. Notably, this catalyst also worked well for the carboxylative cyclization of propargylic amines with carbon dioxide with