<i>N,N′</i>-Dialkyl-4-Aryl-3,4-Dihydropyrimidinones and Thiones: Ceric Ammonium Nitrate Catalyzed Synthesis and Molecular Structure Determination by X-ray Crystallography
作者:Chingrishon Kathing、Sushil Kumar、Shokip Tumtin、Nongthombam Geetmani Singh、Jims World Star Rani、Ridaphun Nongrum、Rishanlang Nongkhlaw
DOI:10.1002/jhet.2735
日期:2017.3
This work presents a microwave assisted solvent‐free synthesis of N,N′‐dialkyl‐4‐aryl‐3,4‐dihydropyrimidinones/thiones in the presence of Ceric Ammonium Nitrate (CAN) via direct condensation of aromatic aldehydes, β‐keto ester, and N,N′‐dialkylurea/thiourea. The highlights of the methodology adopted are (i) facile condensation of the reactants into product without any side‐products, and (ii) short
这项工作提出了在硝酸铈铵(CAN)存在下通过芳族醛,β-酮酸酯的直接缩合在微波辅助下无溶剂合成N,N'-二烷基-4-芳基-3,4-二氢嘧啶酮/硫酮的方法,以及N,N'-二烷基脲/硫脲。所采用方法的重点是:(i)反应物易于缩合为无任何副产物的产物;(ii)反应时间短,产率高,纯度高。所有合成的化合物都通过光谱技术(例如FTIR,1 H NMR,13 C NMR和Mass)进行了表征和建立。该化合物的结构通过单晶X射线衍射分析得到了进一步证实。
The development of an ecofriendly procedure for alkaline metal (II) sulfate promoted synthesis of<i>N</i>,<i>N</i>â²-dimethyl substituted (unsubstituted)-4-aryl-3,4-dihydropyrimidones (thiones) and corresponding bis-analogues in aqueous medium: Evaluation by green chemistry metrics
作者:Chhanda Mukhopadhyay、Arup Datta
DOI:10.1002/jhet.283
日期:——
Different alkalinemetal (II) sulfates were used as catalysts for the N,N′-dimethylsubstituted as well as unsubstituted 4-aryl-3,4-dihydropyrimidones (thiones) and their correspondingbis-analogues in aqueousmedium. Among the various salts, MgSO4·7H2O (Epsom salt) proved to be the best catalyst giving the desired products in good to excellent yields. This catalyst enables the construction of a series