A highly regioselective ortho-acetoxylation of N-(2-benzoylphenyl)benzamides has been achieved using a catalytic amount of Pd(OAc)(2) (10 mol %) and a stoichiometric amount of Phl(OAc)(2) in a mixture of acetic anhydride and acetic acid via C-H activation to produce the corresponding 2-acetoxybenzamides in good yields. ortho-Methoxylation has been accomplished using methanol under similar conditions. (C) 2011 Elsevier Ltd. All rights reserved.
Chiral Phosphoric Acid Catalyzed Kinetic Resolution of 2‐Amido Benzyl Alcohols: Asymmetric Synthesis of 4
<i>H</i>
‐3,1‐Benzoxazines
作者:Subramani Rajkumar、Mengyao Tang、Xiaoyu Yang
DOI:10.1002/anie.201913896
日期:2020.2.3
An efficient method for the asymmetricsynthesis of 4H-3,1-benzoxazines was developed by kinetic resolution of 2-amido benzyl alcohols using chiral phosphoric acidcatalyzed intramolecular cyclizations. A broad range of benzyl alcohols (both secondary and tertiaryalcohols) were kinetically resolved with high selectivities, with an s factor of up to 94. Mechanistic studies were performed to elucidate