Aldehydes and ketones, on treatment with a low-valent cerium reagent, undergo reductive dimerization to produce the corresponding pinacols in high yield.
醛和酮经低价铈试剂处理后,进行还原二聚化,从而以高收率生产相应的频哪醇。
Ytterbium Metal Mediated Synthesis of Symmetrical and Unsymmetrical Pinacols from Carbonyl Compounds
Reaction of aromatic aldehydes and ketones with ytterbium metal gives the corresponding pinacols in high yields. Cross-coupling reaction of benzophenone with other carbonyl compounds to produce unsymmetrical pinacols is also described.
Herein, we successfully achieve this goal by employing a recyclable solid acid/ionicliquidcatalyst system. The dehydration of alkyl- and cycloalkyl-derived diols in an Amberlyst-15/[Emim]Cl system afforded the corresponding 1,3-dienes in good yields, while a Nafion/[Emim]Cl system was demonstrated to be a better catalyst system for the dehydration of aryl-substituted substrates. Our protocol features
Parallel Paired Photoelectrochemical Bromination of Alkylarenes with Electrochemical Pinacol Coupling
作者:Hongshuai Chen、Chaoren Shen、Kaiwu Dong
DOI:10.1021/acs.joc.3c02556
日期:2024.2.16
A paired electrochemical method for paralleling benzylic bromination of alkylarenes under irradiation with reductive pinacol coupling in a divided cell has been developed. A variety of benzyl bromides at the anode and pinacols at the cathode were obtained simultaneously in moderate-to-high faradaic efficiency. This parallel paired electrochemical protocol showed a broad substrate scope and high chemoselectivity
New Reagent for Reductive Coupling of Carbonyl and Imine Compounds: Highly Reactive Manganese-Mediated Pinacol Coupling of Aryl Aldehydes, Aryl Ketones, and Aldimines