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。