Copper-Catalyzed Site-Selective Intramolecular Amidation of Unactivated C(sp<sup>3</sup>)H Bonds
作者:Xuesong Wu、Yan Zhao、Guangwu Zhang、Haibo Ge
DOI:10.1002/anie.201311263
日期:2014.4.1
of aliphatic amides, directed by a bidentate ligand, was developed using a copper‐catalyzed sp3 CH bond functionalization process. The reaction favors predominantly the CHbonds of β‐methyl groups over the unactivated methylene CHbonds. Moreover, a preference for activating sp3 CHbonds of β‐methyl groups, via a five‐membered ring intermediate, over the aromatic sp2 CHbonds was also observed in
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
A new method of cobalt-catalyzed synthesis of pyrrolidinones from aliphatic amides and terminal alkynes was discovered through a C-Hbond functionalization process on unactivated sp(3) carbons with the silver cocatalyst using a bidentate auxiliary. For the first time, a broad range of easily accessible alkynes are exploited as the reaction partner in C(sp(3))-H bondactivation to give the important
β-C(sp3)–H bonds of propioamides with organosilanes is described. The reaction proceeds with the assistance of an 8-aminoquinolyl auxiliary in a tandem way by the first oxidation of β-C(sp3)–H bonds and subsequent arylation/vinylation to give the aryloxylation/vinyloxylation products. This unusual aryloxy/vinyloxy forming reaction offers a new avenue for the functionalization of unactivated sp3 C–H
Nickel-Catalyzed Site-Selective Alkylation of Unactivated C(sp<sup>3</sup>)–H Bonds
作者:Xuesong Wu、Yan Zhao、Haibo Ge
DOI:10.1021/ja413131m
日期:2014.2.5
The direct alkylation of unactivated sp(3) C-H bonds of aliphatic amides was achieved via nickel catalysis with the assist of a bidentate directing group. The reaction favors the C-H bonds of methyl groups over the methylene C-H bonds and tolerates various functional groups. Moreover, this reaction shows a predominant preference for sp(3) C-H bonds of methyl groups via a five-membered ring intermediate