We developed a palladium-catalyzedC–H transformation that enabled the synthesis of ketones from aldehydes and (hetero)aryl halides. The use of picolinamide ligands was key to achieving the transformation. Heteroaryl ketones, as well as diaryl ketones, were synthesized in good to excellent yields, even in gram-scale, using this reaction. Results of density functional theory (DFT) calculations support
palladium-catalyzed construction of ketones via Suzuki-Miyaura reaction using acid fluorides is described. In contrast to typical acyl electrophiles such as acid chlorides, acid fluorides are uncommon acyl electrophiles to use in boron-based coupling probably due to a high level of stability toward nucleophiles. This first attempt to use acid fluorides as a coupling partner with boronic acid allowed highly
The synthesis of aromatic ketones by chromium-catalyzed Kumada arylation of secondary amides with organomagnesium reagents is described. This reaction was enabled by using low-cost chromium(III) salt as a precatalyst, combined with trimethylsilyl chloride as an additive, and presents a rare example of catalytic transformation of secondary amides to ketones at room temperature. It was shown that catalytically
Palladium-Catalyzed Silylation of Aryl Chlorides with Hexamethyldisilane
作者:Eric McNeill、Timothy E. Barder、Stephen L. Buchwald
DOI:10.1021/ol701518f
日期:2007.9.1
A method for the palladium-catalyzedsilylation of arylchlorides has been developed. The method affords desired product in good yield, is tolerant of a variety of functional groups, and provides access to a wide variety of aryltrimethylsilanes from commercially available arylchlorides. Additionally, a one-pot procedure that converts arylchlorides into aryl iodides has been developed.
Direct Dehydrogenative Access to Unsymmetrical Phenones
作者:Congjun Yu、Raolin Huang、Frederic W. Patureau
DOI:10.1002/anie.202201142
日期:2022.5.9
The Friedel–Craftsreaction is an emblematic method for constructing C−C bonds at aromatic positions. Rendering this reaction dehydrogenative on a broad scope of substrates under simple reactionconditions constitutes an important milestone for synthetic chemistry.