Sequential One-Pot Synthesis of Imidazoles and<i>2H</i>-Imidazolones from β-Ketoamines, Acylating Agents and Ammonium Acetate
作者:Hitesh B. Jalani、Eeda Venkateswararao、Manoj Manickam、Sang-Hun Jung
DOI:10.1002/bkcs.11005
日期:2016.12
synthesis of diversely substituted imidazoles and 2H‐imidazolones from β‐ketoamines, acylating agents, and ammonium acetate has been described herein. This approach involves [3+1+1] cyclization through consecutive formation of three C–N bonds as a sequence of initial amidation of β‐ketoamines with acylating agent, β‐iminoketoamide formation with ammonia, and acid catalyzed concomitant cyclodehydration
本文描述了一种高效,实用,无过渡金属的三组分合成方法,该方法由β-酮胺,酰化剂和乙酸铵合成各种取代的咪唑和2H-咪唑啉酮。该方法涉及通过依次形成三个C–N键作为[3 + 1 + 1]的环化过程,这是β-酮胺与酰化剂的酰胺化反应的初始序列,与氨形成β-亚氨基酮酰胺,以及酸催化的伴随的环脱水以提供咪唑和2H-咪唑啉酮。该方法具有以下优势:单瓶操作,容易获得的起始原料,温和的条件,宽泛的官能团耐受性和简单的后处理程序。