Copper(ii) ionic liquid catalyzed cyclization–aromatization of hydrazones with dimethyl acetylenedicarboxylate: a green synthesis of fully substituted pyrazoles
The Lewis acid room temperature ionicliquid, [n-Bu4P][CuBr3], was found to be an efficient and reusable catalyst for three component synthesis of fully substituted pyrazoles from the reaction of aldehydes, arylhydrazines and dimethyl acetylenedicarboxylate (DMAD). This catalytic system is simple and chemoselective with high yields.
发现路易斯酸室温离子液体[ n -Bu 4 P] [CuBr 3 ]是一种有效和可重复使用的催化剂,用于由醛,芳基肼和三乙胺的反应合成全取代吡唑的三组分。乙炔二羧酸二甲酯(DMAD)。该催化体系简单且具有高收率的化学选择性。