The first aryliodide catalyzed intramolecular C–H amination of phenylurea has been disclosed for high-efficiency synthesis of benzimidazolone derivatives in excellent yields (up to 97%) by an operationally simple one-step organocatalytic oxidative process. Fluorinated protic alcohols can efficiently accelerate the conversion of this transformation. The straightforward method has good functional group
Oxidative cyclization of acyclic ureas with bis(trifluoroacetoxy)iodobenzene to generate N-substituted 2-benzimidazolinones
作者:Arthur G. Romero、William H. Darlington、E.Jon Jacobsen、John W. Mickelson
DOI:10.1016/0040-4039(96)00291-2
日期:1996.4
2-benzimidazolinones from secondary aromaticamines is presented. Sequential treatment of a secondary aromaticamine with phosgene and methoxylamine afforded an acyclic 3-substituted 3-aryl-1-methoxy urea. Brief exposure of this urea to bis(trifluoroacetoxy)iodobenzene induced an oxidative cyclization to the ortho-position of the benzene ring, resulting in the formation of a 3-substituted 1-methoxy-2-benzimidazloinone