Propargylation of aromatic compounds using Ce(OTf)3 as catalyst
作者:Claudio C. Silveira、Samuel R. Mendes、Guilherme M. Martins
DOI:10.1016/j.tetlet.2012.01.046
日期:2012.3
Ce(OTf)(3) was successfully employed as catalyst for the activation of the hydroxyl group in the Friedel-Crafts reaction of aromatic compounds with propargylic alcohols in nitromethane. The products were obtained in good to excellent yields. (C) 2012 Elsevier Ltd. All rights reserved.
B(C<sub>6</sub>F<sub>5</sub>)<sub>3</sub>-Catalyzed Sequential Additions of Terminal Alkynes to <i>para</i>-Substituted Phenols: Selective Construction of Congested Phenol-Substituted Quaternary Carbons
作者:Hui Chen、Mo Yang、Guoqiang Wang、Liuzhou Gao、Zhigang Ni、Jingxiang Zou、Shuhua Li
DOI:10.1021/acs.orglett.1c01863
日期:2021.7.16
We have developed a borane-catalyzed sequential addition of terminal alkynes to para-substitutedphenols, which affords a wide range of ortho-propargylic alkylated phenols bearing congested quaternary carbons. Control experiments combined with DFT calculations suggest that the reaction undergoes a sequential phenol alkenylation/hydroalkynylation process. Further extension of this strategy to the construction