unactivated amides is one of the most difficult challenges in organic chemistry, and an applicable method for cleaving amides used as directing groups in regioselective functionalization reactions has not been reported. Herein, we report direct catalytic alcoholysis of 8-aminoquinoline amides, which are highly effective directing groups in regioselective functionalization reactions. The reactions proceeded
A Pd‐catalyzed directed trifluoromethylthiolation of acrylamides and aromatic amides by C–H bond functionalization was developed by using the Munavalli reagent in the absence of additives. This general approach allowed the direct introduction of the SCF3 group on unsaturated amides in moderate to good yields and offered a straightforward access to various original SCF3‐containing molecules.
<i>Z</i>-Selective Pd-catalyzed 2,2,2-trifluoroethylation of acrylamides at room temperature
作者:Louise Ruyet、Maria I. Lapuh、Vijay S. Koshti、Tamás Földesi、Philippe Jubault、Thomas Poisson、Zoltán Novák、Tatiana Besset
DOI:10.1039/d1cc02007b
日期:——
2-trifluoroethylation of acrylamides by Pd-catalyzed C–H bond activation was reported by using a fluorinated hypervalentiodinereagent as a coupling partner. At room temperature, this additive-free approach allowed the synthesis of Z-2,2,2-trifluoroethylated acrylamides (19 examples, up to 73% yield) in a stereoselective manner. Under these mild reaction conditions, the methodology turned out to be functional
Palladium-Catalyzed C–H Functionalization of Aryl Acetamides and Benzoquinones: Synthesis of Substituted Aryl Quinones
作者:Ananya Dutta、Masilamani Jeganmohan
DOI:10.1021/acs.joc.2c01625
日期:2022.10.7
An efficient synthesis of aryl-substituted quinones via Pd(II)-catalyzed C–H functionalization of less expensive and abundant benzoquinones with aryl acetamides is demonstrated. An auxiliary ligand N,N-bidentate-directing group 8-aminoquinoline plays a crucial role in the success of the reaction. A broad range of substituted phenyl acetamides including commercially available drug molecules were examined
The Pd-catalyzed diastereos elective trifluoromethylthiolation of acrylamides was developed to allow the formation of the Z-isomer as a single product. Using a C-H bond functionalization strategy, the method was applied to a broad range of a aryl, alpha-alkyl, and alpha,beta-disubstituted acrylamides bearing the amide derived from the 8-aminoquinoline as a directing group. Mechanistic studies as well as postfunctionalization of the products were performed. This approach opens new routes to unprecedented SCF3-containing scaffolds.