The weak acid has been identified as an efficient basicity-mask to overcome the basicitybarrierimparted by aliphaticamines in the Pd-catalyzed hydroaminocarbonylation, which enables both aromatic and aliphaticamines to be applicable in the palladium-catalyzedhydroaminocarbonylation reaction. Notably, by using this protocol, the marketed herbicide of Propanil and drug of Fentanyl could be easily
Palladium-catalyzed highly regioselective hydroaminocarbonylation of aromatic alkenes to branched amides
作者:Jinping Zhu、Bao Gao、Hanmin Huang
DOI:10.1039/c7ob00371d
日期:——
Pd(t-Bu3P)2 has been successfully identified as an efficient catalyst for the hydroaminocarbonylation of aromatic alkenes to branched amides under relatively mild reaction conditions. With hydroxylamine hydrochloride as an additive, both aliphatic and aromatic amines could be used as coupling partners for the present reaction, leading to production of branched amides in high yields with excellent regioselectivities
An α‐Cyclopropanation of Carbonyl Derivatives by Oxidative Umpolung
作者:Adriano Bauer、Giovanni Di Mauro、Jing Li、Nuno Maulide
DOI:10.1002/anie.202007439
日期:2020.10.5
nucleophiles is often associated with umpolung and cationic mechanisms. Herein, we report a general process converting a range of ketone derivatives into α‐cyclopropanated ketones by oxidative umpolung. Mechanistic investigation and careful characterization of side products revealed that the reaction follows an unexpected pathway and suggests the intermediacy of non‐classical carbocations.