Catalyst-Free, Rapid Synthesis of Fused Bicyclic Thiazolo-Pyrimidine and Pyrimido-Thiazine Derivatives by a Microwave-Assisted Method
摘要:
The present investigation deals with the rapid microwave-assisted synthesis of compounds containing fused bicyclic systems. Dihydropyrimidines obtained via a microwave-assisted Biginelli reaction were treated with dibromo alkanes under microwave conditions to yield thiazolo-pyrimidine and pyrimido-thiazine systems. The usefulness of this method lies in carrying out the reaction without a catalyst and solvent in a shorter time. The reaction was successfully extended to develop fused systems from benzimidazole-2-thiol.
Selective cyclization of S‐substituted pyrimidinethione: Synthesis and antimicrobial evaluation of novel polysubstituted thiazolopyrimidine and thiazolodipyrimidine derivatives
作者:Hayat E. Alzahrani、Ahmed M. Fouda、Ayman M. S. Youssef
DOI:10.1002/jccs.201900199
日期:2020.5
chloroacetonitrile, and phenacyl bromide to give the corresponding S‐substituted derivatives Va–c. Treatment of IVa–c with ethyl bromoacetate in ethanol under reflux in the presence of potassium hydroxide solution led to the formation of N‐(4‐chlorophenyl)‐7‐methyl‐3‐oxo‐5‐(aryl)‐2,3‐dihydro‐5H‐thiazolo[3,2‐a]pyrimidine‐6‐carboxamide derivative VIII a–c in a single‐step synthesis. On the other hand, compound
Catalyst-Free, Rapid Synthesis of Fused Bicyclic Thiazolo-Pyrimidine and Pyrimido-Thiazine Derivatives by a Microwave-Assisted Method
作者:Vijay R. Virsodia、Nikhil R. Vekariya、Atul T. Manvar、Rupesh C. Khunt、Bhavin R. Marvania、Bharat S. Savalia、Anamik K. Shah
DOI:10.1080/10426500802077564
日期:2008.12.23
The present investigation deals with the rapid microwave-assisted synthesis of compounds containing fused bicyclic systems. Dihydropyrimidines obtained via a microwave-assisted Biginelli reaction were treated with dibromo alkanes under microwave conditions to yield thiazolo-pyrimidine and pyrimido-thiazine systems. The usefulness of this method lies in carrying out the reaction without a catalyst and solvent in a shorter time. The reaction was successfully extended to develop fused systems from benzimidazole-2-thiol.