Silver catalyzed zinc Barbier reaction of benzylic halides in water
作者:Lothar W. Bieber、Elisabeth C. Storch、Ivani Malvestiti、Margarete F. da Silva
DOI:10.1016/s0040-4039(98)02199-6
日期:1998.12
Benzylic chlorides react in aqueous dibasic potassium phosphate under silver catalysis with aromatic aldehydes in the presence of zinc dust to give 1,2-diaryl alcohols in moderate to good yields. Dimerization to bibenzyls and reduction of the halide are important side reactions. A wide range of substituted aromatic and heteroaromatic aldehydes and of substituted benzylic chlorides can be used. Aliphatic
Ring-opening of epoxides furnishing either linear or branched products belongs to the group of classic transformations in organic synthesis. However, the regioselective cross-electrophile coupling of aryl epoxides with aryl halides still represents a key challenge. Herein, we report that the vitamin B12/Ni dual-catalytic system allows for the selective synthesis of linear products under blue-light
提供线性或支化产物的环氧化物的开环属于有机合成中的经典转化组。然而,芳基环氧化物与芳基卤化物的区域选择性交叉亲电偶联仍然是一个关键挑战。在此,我们报告了维生素 B 12 /Ni 双催化系统允许在蓝光照射下选择性合成线性产物,从而补充获得支化醇的方法。实验和理论研究证实了所提出的涉及烷基钴胺素作为该反应中间体的机制。
作者:Hongyu Wang、Zhihui Wang、Guo Zhao、Velayudham Ramadoss、Lifang Tian、Yahui Wang
DOI:10.1021/acs.orglett.2c01286
日期:2022.5.27
bond formation reaction is achieved through electrochemical reduction of alcoholic phosphates or sulfonates with aldehydes or ketones. Alcohol derivatives of phosphates undergo single-electron reduction under electrochemical conditions followed by a spontaneous cleavage of the C–O bond with the exothermic loss of phosphate resulting in an alkyl radical species. Subsequently, radical intermediates are further
β‐Arylation of Racemic Secondary Benzylic Alcohols to Access Enantioenriched β‐Arylated Alcohols
作者:Wang Miao、Jinyu Zhang、Yanyan Yang、Weijun Tang、Dong Xue、Jianliang Xiao、Huaming Sun、Chao Wang
DOI:10.1002/anie.202306015
日期:2023.7.24
catalyst, the first example of β-arylation of secondary alcohols with aryl bromides has been developed via borrowing hydrogen catalysis enabled by an MPV type hydrogen transfer process. In addition, the enantioconvergent version of the reaction has also been realized under the catalysis of Pd and Ru, allowing for the transformation of racemic secondary alcohols into enantioenriched chiral alcohols with good