A new synthesis of chloroheterocycles via metalhalogen exchange between trichloroacetyl derivatives and heteroaromatic lithium and Grignard reagents
作者:Carla Boga、Erminia Del Vecchio、Luciano Forlani、Lilia Milanesi、Paolo Edgardo Todesco
DOI:10.1016/s0022-328x(99)00363-0
日期:1999.10
rapidly produces the corresponding 2-chloro derivatives in high yields through a metalhalogen exchange mechanism. The use of ethyl trichloroacetate can give better results with respect to those obtained with trichloroacetyl chloride, which probably involves dichloroketene formation. The reaction with Grignard reagents is more complex: in fact, 2-benzothiazolylmagnesium chloride with ethyl trichloroacetate
芳族氮杂杂环的2-lithio衍
生物与三
氯乙酰基衍
生物之间的反应通过
金属-卤素交换机理快速高产地产生了相应的2-
氯衍
生物。与用
三氯乙酰氯得到的
三氯乙酸乙酯相比,使用
三氯乙酸乙酯可以得到更好的结果,
三氯乙酰氯可能涉及二
氯乙烯的形成。与
格氏试剂的反应更加复杂:实际上,2-
苯并噻唑基
氯化镁与
三氯乙酸乙酯或
三氯乙酰氯的反应分别生成
2-氯苯并噻唑和大量的
1,3-苯并噻唑-2-羧酸乙酯或2-
苯并噻唑基二
氯甲基酮。