Cu-catalyzed convenient synthesis of 2-trifluoromethyl benzimidazoles <i>via</i> cyclization of <i>o</i>-phenylenediamines with hexafluoroacetylacetone
作者:Xia Chen、Xiao-Yu Zhou、Hai-Long Liu、Sheng Zhang、Ming Bao
DOI:10.1039/d3ob01702h
日期:——
with hexafluoroacetylacetone proceeded smoothly in the presence of Cu2O as the catalyst to produce 2-trifluoromethyl benzimidazoles in satisfactory to excellent yields (up to >99% yield). The CF3 source, hexafluoroacetylacetone, acted not only as cyclization partner, but also acted as a ligand for the Cu catalyst. Various synthetically useful functional groups, such as halogen atoms, cyano, and methoxycarbonyl
本文描述了一种高效、便捷的2-三氟甲基苯并咪唑的合成方法。在 Cu 2 O 催化剂存在下,各种邻苯二胺与六氟乙酰丙酮的环化反应顺利进行,生成 2-三氟甲基苯并咪唑,收率令人满意(高达 >99%)。 CF 3源六氟乙酰丙酮不仅充当环化配偶体,而且充当Cu催化剂的配体。各种合成上有用的官能团,例如卤素原子、氰基和甲氧基羰基,在环化反应过程中保持完整。对该反应机理进行了彻底的研究,确定涉及七元环状二亚胺中间体。