Umpolung of Carbonyl Groups as Alkyl Organometallic Reagent Surrogates for Palladium-Catalyzed Allylic Alkylation
作者:Dianhu Zhu、Leiyang Lv、Chen-Chen Li、Sosthene Ung、Jian Gao、Chao-Jun Li
DOI:10.1002/anie.201809112
日期:2018.12.10
carbon nucleophiles is difficult and remains a major challenge. Reported here is a highly chemo‐ and regioselective direct palladium‐catalyzed C‐allylation of hydrazones, generated from carbonyls, as a source of umpolung unstabilized alkyl carbanions and surrogates of alkyl organometallicreagents. Contrary to classical allylation techniques, this umpolung reaction utilizes hydrazones prepared not
Radical Addition-Triggered Remote Migratory Isomerization of Unactivated Alkenes to Difluoromethylene-Containing Alkenes Enabled by Bimetallic Catalysis
A fascinating alkeneremote migratory isomerization engendered by carbon radical addition to C═C bond in alkenes via bimetalliccatalysis has been disclosed. A diverse array of alkenes bearing distantly incorporated the difluoromethylene (RCF2R′) functionality have been expediently obtained. The retainment of C═C bonds in products could serve as an useful synthetic platform furnishing otherwise difficult
An orthogonal bimetallicrelay catalytic strategy capable of enantioselectively imbedding a boryl functionality at a remote, less-activated site of aryl alkenes is disclosed. This approach was applicable to unactivated terminal and internal alkenes, as well as a mixture of olefin isomers, thus leading to the corresponding chiral products with a boryl-substituted stereogenic center β to a functional
Regioselective coupling of benzyl chlorides with allyl and allenyl boronates catalysed by a bidentate phosphine ligand/palladium catalyst
作者:Sheng Zhang、Junchao Yin、Ziyang Wang、Yang Li、Yukang Fu、Ji Ma、Zhilong Xie、Ming Bao
DOI:10.1039/d3cc00279a
日期:——
A palladium-catalysed aromative benzylic allylation and allenylation of benzyl chlorides with allyl and allenyl pinacolborates is described for the first time. The reactions proceed smoothly in the presence of a bidentate phosphine ligand to afford normal cross-coupling products in good yields. This novel synthetic procedure exhibits good tolerance for various electron-withdrawing and -donating functional