Catalytic Functionalization of Unactivated sp<sup>3</sup> C–H Bonds via <i>exo</i>-Directing Groups: Synthesis of Chemically Differentiated 1,2-Diols
作者:Zhi Ren、Fanyang Mo、Guangbin Dong
DOI:10.1021/ja3082186
日期:2012.10.17
describe a Pd-catalyzed site-selective functionalization of unactivated aliphatic C-H bonds, providing chemically differentiated 1,2-diols from monoalcohol derivatives. The oxime was employed as both a directing group (DG) and an alcohol surrogate for this transformation. As demonstrated in a range of substrates, the C-H bonds β to the oxime group are selectively oxidized. Besides activation of the methyl
Palladium-catalyzed intermolecular amination of unactivated C(sp<sup>3</sup>)–H bonds via a cleavable directing group
作者:Lianwen Jin、Xiaoli Zeng、Siyang Li、Xuechuan Hong、Guofu Qiu、Peng Liu
DOI:10.1039/c7cc00808b
日期:——
Cleavable directing group promoted palladium-catalyzed intermolecularamination of unactivatedC(sp3)-Hbonds with NFSI as the amino source was developed.
palladium-catalyzed β-C(sp3)–H nitrooxylation of aliphatic alcohols with AgNO2 is reported. An 8-formylquinoline-derived oxime is installed as an exo-type directing group for sp3 C–H activation and selectfluor acts as the oxidant. The reaction tolerates a variety of functional groups and shows good selectivity for β-C–H nitrooxylation of alcohols.