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
Pd(II)-Catalyzed Primary-C(sp<sup>3</sup>)–H Acyloxylation at Room Temperature
作者:Raja K. Rit、M. Ramu Yadav、Akhila K. Sahoo
DOI:10.1021/ol301579q
日期:2012.7.20
With the aid of a novel S-methyl-S-2-pyridyl-sulfoximine (MPyS) directing group (DG), the unactivated primary beta-C(sp(3))-H bond of MPyS-N-amides oxidizes at room temperature. The catalytic conditions are applicable to the diacetoxylation of primary beta,beta'-C(sp(3))-H bonds, and the carboxylic acid solvent is pivotal in the formation of the C-O bond. The MPyS-DG cleaves from the oxidation products and is recovered. This method provides convenient access to alpha,alpha'-disubstituted-beta-hydroxycarboxylic acids.