Direct synthesis of 2,4,5-trisubstituted imidazoles and di/tri-substituted pyrimidines via cycloadditions of α,β-unsaturated ketones/aldehydes and N′-hydroxyl imidamides
作者:Ping Wu、Xueguo Zhang、Baohua Chen
DOI:10.1016/j.tetlet.2019.03.025
日期:2019.4
di/trisubstituted pyrimidines via iron-catalyzed cross-dehydrogenative coupling (CDC), with excellent tolerance and yields, has been developed. In this report, α,β-unsaturated aldehydes/ketones and N′-hydroxyl imidamides undergo [3+2] and [3+3] cycloadditions in two processes, involving iron-mediated Michael reaction, Robinson Annulation and 1,5-electrocyclization.
已经开发了一种通过铁催化的交叉脱氢偶联(CDC)合成5-乙酰基咪唑和二/三取代嘧啶的有效途径,具有优异的耐受性和产率。在该报告中,α,β-不饱和醛/酮和N'-羟基亚酰胺在两个过程中经历了[3 + 2]和[3 + 3]环加成,涉及铁介导的迈克尔反应,鲁宾逊环化和1,5-电环化。 。