RETRACTED: A room temperature copper catalyzed N-selective arylation of β-amino alcohols with iodoanilines and aryl iodides
作者:Priyabrata Das、Jef K. De Brabander
DOI:10.1016/j.tet.2013.04.128
日期:2013.9
An efficient method is described for the synthesis of N-(2-aminophenyl)-2-hydroxyethylamines via a copper catalyzed N-selective arylation of beta-amino alcohols with iodoanilines. The corresponding coupling products are useful intermediates for the synthesis of a variety of N-2-hydroxyethyl-substituted benzimidazoles, benzimidazolones, and iminobenzimidazoles. We found that 2-iodoaniline only arylates certain amino alcohols but not amines lacking a hydroxyl group. We also demonstrate the arylation of sterically demanding beta-amino alcohols, such as ephedrine and prolinol with aryl iodides at room temperature. (C) 2013 Elsevier Ltd. All rights reserved.
Non-C2-Symmetric Bis-Benzimidazolium Salt Applied in the Synthesis of Sterically Hindered Biaryls
作者:Yen-Hsin Chen、Shu-Jyun Huang、Tung-Yu Hsu、Pei-Yu Hung、Ting-Rong Wei、Dong-Sheng Lee、Ta-Jung Lu
DOI:10.3390/molecules26216703
日期:——
bis-benzimidazolium salt provided a bulky steric group on the ethylene bridge; which facilitates the catalytic efficacy in the C(sp2)–C(sp2) formation. Its catalytic activity in Suzuki–Miyaura cross-coupling reaction of unactivated aryl chlorides has been found to have high efficacy in 1 mol% Pd loading. This protocol demonstrated the potential on the synthesis of stericallyhindered biaryls.