A visible-light metal-free photocatalytic synthesis of 3-position substituted 3,4-dihydroisoquinolin-1(2H)-one derivatives under mild conditions in moderate to good yields is described. EosinY Na, an organic dye, which is of low cost and has good availability, is used as the photocatalyst. A wide range of substrates are tolerated and the gram-scale reaction can also proceed smoothly. Mechanistic studies
Rhenium-catalyzed allylation of C–H bonds of benzoic and acrylic acids
作者:Yoichiro Kuninobu、Kazuhiro Ohta、Kazuhiko Takai
DOI:10.1039/c1cc12359a
日期:——
We have succeeded in the allylation of aromatic and olefinic CâH bonds of benzoic and acrylic acids using a rhenium catalyst, Re2(CO)10. In this reaction, isomerization of the introduced allyl group to the 1-propenyl group did not occur.
Palladium‐Catalyzed Alkene Thioacylation: A C−S Bond Activation Approach for Accessing Indanone Derivatives
作者:Jianing Wu、Wen‐Hua Xu、Hong Lu、Peng‐Fei Xu
DOI:10.1002/adsc.202100293
日期:2021.6.21
alkene thioacylation reaction initiated by the activation of thioester C(acyl)−S bonds is reported. This approach successfully suppressed decarbonylation and β-hydrogen elimination with related acyl and alkyl metal thiolate intermediates, providing an efficient and atom-economical method to access indanone scaffolds. Mechanistic studies provide support for C(acyl)−Pd bondinsertion of olefins. The synthetic
Synergistic Palladium-Catalyzed C(sp3)H Activation/C(sp3)O Bond Formation: A Direct, Step-Economical Route to Benzolactones
作者:Petr Novák、Arkaitz Correa、Joan Gallardo-Donaire、Ruben Martin
DOI:10.1002/anie.201105894
日期:2011.12.16
Simplified access: Substituted benzolactones can be obtained in one step by a Pd‐catalyzed ligand‐accelerated C(sp3)H bond‐activation/C(sp3)O bond‐formation protocol. This step‐economical approach enables the preparation of benzolactones with a wide variety of functional groups and different substitution patterns. The method is characterized by its simplicity and the avoidance of protecting groups
Acid–base-sensitive allylic oxidation of 2-allylbenzoic acids to form phthalides
作者:Le Thi Ngoc Chuc、Thi Anh Hong Nguyen、Duen-Ren Hou
DOI:10.1039/d0ob00303d
日期:——
corresponding phthalides selectively. Mechanistic studies, including the corresponding reaction of (E)-2-(1-propenyl)benzoicacid to 3-methylisocoumarin, isomerization reaction of 3-vinylphthalide to 3-ethylidenephthalide, and the kinetic isotope effect using 2-(1,1-d2-allyl)benzoicacid, revealed the competition between Wacker-type oxidation and allylic C-H cleavage, which is the key step to generating