Auxiliary-Assisted Palladium-Catalyzed Direct C(sp<sup>3</sup>)–H Sulfonamidation To Afford 1,2-Amino Alcohol Derivatives
作者:Yi Dong、Gang Liu
DOI:10.1021/acs.joc.6b02975
日期:2017.4.7
An auxiliary-assisted Pd-catalyzed C(sp3)–H sulfonamidation approach using NFSI as both nitrogen source and oxidant to afford 1,2-amino alcohol derivatives is described in this paper. This method is novel and attractive because of its high yields, wide range of substrate scopes, and good tolerance for many functional groups. Oximido and sulfonyl group can be removed with this method.
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 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.