Enantioselective Palladium‐Catalyzed Cross‐Coupling of α‐Bromo Carboxamides and Aryl Boronic Acids
作者:Bowen Li、Tiejun Li、Muinat A. Aliyu、Zhen Hua Li、Wenjun Tang
DOI:10.1002/anie.201905174
日期:2019.8.12
report an enantioselective palladium‐catalyzedcross‐coupling between α‐bromo carboxamides and aryl boronic acids, generating a series of chiral α‐aryl carboxamides in good yields and excellent enantioselectivities. The development of a chiral P,P=O ligand was critical in overcoming the second transmetalation issue and allows the first asymmetric palladium‐catalyzedcoupling of α‐bromo carbonyl compounds
Enantioselective<i>ortho</i>-CH Cross-Coupling of Diarylmethylamines with Organoborons
作者:Brian N. Laforteza、Kelvin S. L. Chan、Jin-Quan Yu
DOI:10.1002/anie.201505204
日期:2015.9.14
The commonly used para‐nitrobenzenesulfonyl (nosyl) protecting group is employed to direct the CH activation of amines for the first time. An enantioselective ortho‐CH cross‐coupling between nosyl‐protected diarylmethylamines and arylboronic acid pinacol esters has been achieved utilizing chiral mono‐N‐protected amino acid (MPAA) ligands as a promoter.
作者:Yao-Yao Liu、Yuan-Lu Qu、Yan-Shang Kang、Yue-Lu Zhu、Wei-Yin Sun、Yi Lu
DOI:10.1021/acs.orglett.2c00620
日期:2022.5.6
Herein, the Rh-catalyzed consecutive C–H bond olefination/annulation/olefination cascade, tandemly directed by sulfonamide and ester groups, has been developed under mild conditions with the assistance of 1-adamantane carboxylic acid. A seven-membered metallacycle including an ester group was preferred to the five-membered one including a sulfonamide group for the third C–Hactivation. In this transformation
Palladium-Catalyzed, Enantioselective Formal Cycloaddition between Benzyltriflamides and Allenes: Straightforward Access to Enantioenriched Isoquinolines
作者:Xandro Vidal、José L. Mascareñas、Moisés Gulías
DOI:10.1021/jacs.8b12636
日期:2019.2.6
Benzyl and allyltriflamides can engage in Pd-catalyzed oxidative (4+2) annulations with allenes, to produce highly valuable tetrahydroisoquinoline or dihydropyridine skeletons. The reaction is especially efficient when carried out in the presence of designed N-protected amino acids as metal ligands. More importantly, using this type of chiral ligands, it is possible to perform desymmetrizing, annulative C-H activations of prochiral diarylmethylphenyl amides, and thus obtain the corresponding isoquinolines with high enantiomeric ratios.