Site‐Selective Pd‐Catalyzed C(sp
<sup>3</sup>
)−H Arylation of Heteroaromatic Ketones
作者:Anton Kudashev、Olivier Baudoin
DOI:10.1002/chem.202103467
日期:2021.12.15
AbstractA ligand‐controlled site‐selective C(sp3)−H arylation of heteroaromatic ketones has been developed using Pd catalysis. The reaction occurred selectively at the α‐ or β‐position of the ketone side‐chain. The switch from α‐ to β‐arylation was realized by addition of a pyridone ligand. The α‐arylation process showed broad scope and high site‐ and chemoselectivity, whereas the β‐arylation was more limited. Mechanistic investigations suggested that α‐arylation occurs through C−H activation/oxidative addition/reductive elimination whereas β‐arylation involves desaturation and aryl insertion.
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