Efficient and Rapid Synthesis of Highly Functionalized Novel Symmetric 1,4-Dihydropyridines Using Glacial Acetic Acid as Solvent
作者:Shailesh Thakrar、Abhay Bavishi、Dhairya Bhavsar、Shrey Parekh、Hardev Vala、Ashish Radadiya、Manisha Parmar、Mahesh Savant、Anamik Shah
DOI:10.1080/00397911.2011.576448
日期:2012.11.15
Abstract A new series of 1,4-dihydropyridines bearing a pyrazole moiety in the 4-position were synthesized by a variation of the classical Hantzsch synthesis. The reaction of 1,3-diphenyl-1H-pyrazole-4-carbaldehyde 4a–n with 3-amino crotononitrile in the presence of glacial acetic acid afforded novel 3,5-dicyano-2,6-dimethyl 1,4-dihydropyridines 5a–n. The procedure has short reaction time (15–20 min)