Copper-promoted site-selective carbonylation of sp<sup>3</sup> and sp<sup>2</sup> C–H bonds with nitromethane
作者:Xuesong Wu、Jinmin Miao、Yanrong Li、Guigen Li、Haibo Ge
DOI:10.1039/c6sc01087c
日期:——
Copper-promoted direct carbonylation of unactivated sp3 C–H and aromatic sp2 C–H bonds of amides was developed using nitromethane as a novel carbonyl source. The sp3 C–H functionalization showed high site-selectivity by favoring the C–H bonds of α-methyl groups. The sp2 C–Hcarbonylation featured high regioselectivity and good functional group compatibility. Kinetic isotope effect studies indicated
Nickel-Catalyzed Aminoxylation of Inert Aliphatic C(sp<sup>3</sup>)–H Bonds with Stable Nitroxyl Radicals under Air: One-Pot Route to α-Formyl Acid Derivatives
作者:Chunxia Wang、Luoqiang Zhang、Jingsong You
DOI:10.1021/acs.orglett.7b00479
日期:2017.4.7
Nickel-catalyzed aminoxylation of an unactivated C(sp3)–H bond with a stable nitroxyl radical has been accomplished for the first time to offer various N-alkoxyamine derivatives, which further enables a one-pot approach to α-formyl acid derivatives. The aminoxylation process reported also provides direct evidence for the oxidative addition of a cyclometallic intermediate with a free radical, which
Nickel-Catalyzed Direct Arylation of C(sp<sup>3</sup>)–H Bonds in Aliphatic Amides via Bidentate-Chelation Assistance
作者:Yoshinori Aihara、Naoto Chatani
DOI:10.1021/ja411715v
日期:2014.1.22
The Ni-catalyzed, direct arylation of C(sp(3))-H (methyl and methylene) bonds in aliphatic amides containing an 8-aminoquinoline moiety as a bidentate directing group with aryl halides is described. Deuterium-labeling experiments indicate that the C-H bond cleavage step is fast and reversible. Various nickelcomplexes including both Ni(II) and Ni(0) show a high catalytic activity. The results of a
Nickel-Catalyzed Site-Selective Amidation of Unactivated C(sp<sup>3</sup>)H Bonds
作者:Xuesong Wu、Yan Zhao、Haibo Ge
DOI:10.1002/chem.201403356
日期:2014.7.28
nickel‐catalyzed CH bond functionalization process with the assistance of a bidentatedirectinggroup. The reaction favors the CHbonds of β‐methyl groups over the γ‐methyl or β‐methylene groups. Additionally, a predominant preference for the β‐methyl CHbonds over the aromatic sp2 CHbonds was observed. Moreover, this process also allows for the effective functionalization of benzylic secondary sp3 CH bonds