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)
摘要 通过经典 Hantzsch 合成的变体,合成了一系列新的在 4 位带有吡唑部分的 1,4-二氢吡啶。1,3-二苯基-1H-吡唑-4-甲醛4a-n与3-氨基巴豆腈在冰醋酸存在下反应得到新型3,5-二氰基-2,6-二甲基1,4-二氢吡啶5a -n。该程序反应时间短(15-20 分钟),易于处理,产品收率高。所有合成化合物的结构均通过质量、红外、1H 和 13C NMR 以及元素分析进行了很好的表征。图形概要