Access to Benzylic Quaternary Carbons from Aromatic Ketones
作者:You Li、Jingpeng Han、Han Luo、Qiaoyu An、Xiao-Ping Cao、Baosheng Li
DOI:10.1021/acs.orglett.9b02204
日期:2019.8.2
constructing all-carbon quaternary structural units from aryl ketones, revealing that the entire processinvolvesthree consecutive chemical events, namely nucleophilic addition, Meinwald 1,2-hydrogen migration, and alkylation. Interestingly, dimerization of acetophenones results in formation of 2,4-diarylfurans under the employed conditions rather than the quaternary carbon products.
importance in various realms of chemistry, furan occupies a position of eminence among heterocycles. Despite the availability of many methodologies for the synthesis of variably substitutedfurans, a modular convenient synthesis of 2,4-disubstituted furans remains challenging. The present work attempts to bridge that gap through a novel annulation-based approach using feedstock chemicals such as methyl ketones
processes, there has been a renewed focus on utilizing earth-abundant metal catalysts to expand the repertoire of organic reactions and processes. In this work, we have explored the atom-economic oxidative coupling between two important electron-rich heterocycles - indoles and furans - using commonly available, inexpensive metal catalyst CuCl2·2H2O (<0.25$ per g) to develop an expeditious synthesis