Preparation and Utility of Trihaloethyl Imidates: Useful Reagents for the Synthesis of Amidines
作者:Stéphane Caron、Lulin Wei、Jasmin Douville、Arun Ghosh
DOI:10.1021/jo902159z
日期:2010.2.5
2,2,2-Trifluoro- and trichloroethyl imidates, which are easily prepared by reaction of a nitrile and a trihaloethanol in the presence of HCl, have proven to be excellent reagents for the preparation of amidines under mild reaction conditions. Depending on the nature of the amine nucleophile, the imidates can react either as the free-base or the hydrochloride salt in a telescoped process. In several
通过腈和三卤乙醇在HCl存在下的反应很容易制得2,2,2-三氟和三氯乙基酰亚胺酯,已证明是在温和的反应条件下制备am的极好试剂。根据胺亲核试剂的性质,酰亚胺可在伸缩过程中作为游离碱或盐酸盐反应。在几种情况下,从反应混合物中直接分离出所需产物的对溴苯甲酸盐。