Construction of a six-membered fused N-heterocyclic ring via a new 3-component reaction: synthesis of (pyrazolo)pyrimidines/pyridines
作者:P. Mahesh Kumar、K. Siva Kumar、Pradeep Kumar Mohakhud、K. Mukkanti、R. Kapavarapu、Kishore V. L. Parsa、Manojit Pal
DOI:10.1039/c1cc16418j
日期:——
A conceptually new three-component reaction was developed to construct a six-membered fused N-heterocyclic ring affording (pyrazolo)pyrimidines/pyridines as potential inhibitors of PDE4. The reaction is catalyzed by triflic acid in acetic acid in the presence of aerial oxygen.
Ultrasound-Assisted 3-Component Reaction in Acetic Acid Alone: Catalyst / Promoter / Ligand Free Synthesis of Bioactive Pyrazolo[1,5-a]pyrimidines
作者:Namburi Suresh、Bodapati Veera Durgarao、A. Ratnakar、Sunder Kumar Kolli、Mohd Ashraf Ashfaq、Mandava V. Basaveswara Rao、Manojit Pal
DOI:10.2174/1570180814666170126120408
日期:2017.9.8
under ultrasound irradiation has been found to be effective for the three-component reaction involving ethyl-5- amino-1H-pyrazole-4-carboxylate, aromatic aldehydes and terminal alkynes in the presence of aerial oxygen. Methods: The catalyst / promoter / ligand free method afforded a range of pyrazolo[1,5-a] pyrimidines as potential and new cytotoxic agents. Results and Conclusion: While some of these