Iridium(III)-Catalyzed Direct Intermolecular Chemoselective α-Amidation of Masked Aliphatic Carboxylic Acids with Dioxazolones via Nitrene Transfer
作者:Sanjit K. Mahato、Nozomi Ohara、Shrikant M. Khake、Naoto Chatani
DOI:10.1021/acscatal.1c01901
日期:2021.6.18
The Ir(III)-catalyzed direct α-C–H amidation of imidazole-masked aliphatic carboxylic acids with dioxazolones is reported. The presence of an imidazole moiety as a directing group is a key to the success of the reaction. The products can be easily converted to esters and amides in a simple procedure. The reaction shows a broad substrate scope for various substituted 2-acylimidazoles, as well as a variety
A new strategy, a transient homocoupling dimer strategy, for direct catalytic oxidative cross-enolate coupling reactions is developed. Cross-enolate coupling products bearing a (contiguous) tetrasubstituted carbon center were obtained chemoselectively without the need for stoichiometric amounts of strong bases/metal oxidants, and thus, the present catalysis provides a general method for the synthesis
Copper-catalyzed aerobic asymmetric cross-dehydrogenative coupling of C(sp<sup>3</sup>)–H bonds driven by visible light
作者:Kexu Zhou、Ying Yu、Yu-Mei Lin、Yanjun Li、Lei Gong
DOI:10.1039/d0gc00262c
日期:——
Asymmetric cross-dehydrogenative coupling (CDC) of C(sp3)–H bonds shows great potential for rapid and stereoselective construction of C–Cbonds and use of molecular oxygen as the oxidant for such transformations is appealing in the context of green synthetic methodologies. However, the poor reactivity of oxygen at the ground state and the challenges in controlling the stereochemistry make it extremely