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
Analogues of N-hydroxy-N′-phenylthiourea and N-hydroxy-N′-phenylurea as inhibitors of tyrosinase and melanin formation
作者:Marc Criton、Véronique Le Mellay-Hamon
DOI:10.1016/j.bmcl.2008.04.079
日期:2008.6
A series of N-hydroxy-N'-phenylthiourea and N-hydroxy-N'-phenylurea analogues were prepared and evaluated as inhibitors of tyrosinase and melanin formation. The most active analogue 1 inhibited mushroom tyrosinase with an IC(50) of around 0.29 mu M and also retained a substantial potency in cell culture by reducing pigment synthesis by 78%. Therefore, compound 1 could be considered as a promising candidate for preclinical drug development for skin hyperpigmentation application. (C) 2008 Elsevier Ltd. All rights reserved.
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
Catalyst‐Free Electrosynthesis of Benzimidazolones through Intramolecular Oxidative C−N Coupling
作者:Jiang‐Sheng Li、Pan‐Pan Yang、Xin‐Yun Xie、Si Jiang、Li Tao、Zhi‐Wei Li、Cui‐Hong Lu、Wei‐Dong Liu
DOI:10.1002/adsc.202000198
日期:2020.5.12
The electrochemicalsynthesis of N, N’‐disubstituted benzimidazolones from ureas through an intramolecular anodic dehydrogenative N−H/C−H coupling has been developed. The reaction undergoes under the undivided electrolysis conditions and obviates the need for any catalysts and chemical oxidants.