Regioselective, Solvent-Free
Synthesis of 3-Aminoimidazo[1,2-<i>a</i>]pyrimidines Under
Microwave Irradiation Promoted by Zeolite HY
作者:Beining Chen、Mark Thompson、Jenny Hurst
DOI:10.1055/s-0028-1087274
日期:——
Microwave-assisted, solvent-free condensation of 2-aminopyrimidine with aldehydes and isonitriles gave the desired 3-aminoimidazo[1,2-a]pyrimidine products with good to excellent regioselectivity. A hydrogen zeolite (‘zeolite HY’) was found to be a novel and effective promoter for the reaction, generally leading to clean conversion and also permitting use of the normally unreactive 4,6-dimethyl-2-aminopyrimidine.
微波辅助无溶剂的2-氨基嘧啶与醛和异腈的缩合反应产生了所需的3-氨基咪唑[1,2-a]嘧啶产物,具有良好到优异的区域选择性。研究发现氢分子筛(‘分子筛HY’)是该反应的一种新颖且有效的促进剂,通常能实现干净的转化,并且允许使用通常不反应的4,6-二甲基-2-氨基嘧啶。