Direct Transformation of Aryl 2-Pyridyl Esters to Secondary Benzylic Alcohols by Nickel Relay Catalysis
作者:Xianqing Wu、Xiaobin Li、Wenyi Huang、Yun Wang、Hui Xu、Liangzhen Cai、Jingping Qu、Yifeng Chen
DOI:10.1021/acs.orglett.9b00774
日期:2019.4.5
secondary benzylic alcohols via tandem Ni-catalyzed cross-coupling reactions of aromatic 2-pyridyl esters with alkyl zinc reagents and carbonyl group reduction by Ni–H species is achieved. Preliminary mechanistic studies reveal that the Ni–H species is generated in situ via β-hydride elimination of the Negishi reagents. The reaction is catalyzed by bench-stable nickel salts under mild conditions with
通过芳族2-吡啶酯与烷基锌试剂的串联Ni催化的交叉偶联反应,以及Ni-H物种还原的羰基,可以将芳基酯直接转化为仲苄醇。初步的机理研究表明,Ni-H物种是通过Negishi试剂的β-氢化物消除原位生成的。在温和的条件下,具有稳定的官能团耐受性,可通过稳定的镍盐催化该反应。