DDQ-mediated oxidation of sp3 C–H bond for the direct synthesis of vicinal tricarbonyl compounds
作者:Zheng-Lin Wang、Xing-Lan An、Li-Shi Ge、Jing-Hai Jin、Xiaoyan Luo、Wei-Ping Deng
DOI:10.1016/j.tet.2014.04.021
日期:2014.6
A facile and direct synthetic method was developed for the construction of vicinal tricarbonyl compounds (VTCs) in moderate to excellent yields (46-92%), by treating the readily available 1,3-dicarbonyl compounds with 2,2,6,6-tetramethylpiperidine-1-oxyl (TEMPO) in the presence of 2,3-dichloro-5,6-dicyano-1,4-benzoquinone (DDQ). The reaction pathway involves the DDQ-mediated oxidative activation of sp(3) C-H bond and subsequent coupling to TEMPO to form the key intermediate TEMPO-substrate adduct, which can be further converted to VTC products promoted by DDQ (C) 2014 Elsevier Ltd. All rights reserved.