Palladium(<scp>ii</scp>)-catalyzed asymmetric C–H carbonylation to diverse isoquinoline derivatives bearing all-carbon quaternary stereocenters
作者:Yan Li、Xiu-Fen Cheng、Fan Fei、Tian-Rui Wu、Kang-Jie Bian、Xin Zhou、Xi-Sheng Wang
DOI:10.1039/d0cc05219a
日期:——
Enantioselective synthesis of tetrahydroisoquinolines bearing an all-carbon quaternary stereogenic center, was achieved via asymmetric C–H activation with high enantioselectivities (up to 93% ee). Fair substrate tolerance was indicated throughout the scope investigation and no evident loss of enantioselectivity was exhibited in late-stage derivatization. This study provides incentives for the construction
Ligand-Accelerated Palladium(II)-Catalyzed Enantioselective Amination of C(sp<sup>2</sup>)–H Bonds
作者:Xiu-Fen Cheng、Fan Fei、Yan Li、Yi-Ming Hou、Xin Zhou、Xi-Sheng Wang
DOI:10.1021/acs.orglett.0c02216
日期:2020.8.21
The first example of the Pd(II)-catalyzed enantioselective amination of aryl C–H bonds is reported. The key to the successful realization of this asymmetric catalytic transformation was the identification of mono-N-protected α-amino-O-methylhydroxamic acid (MPAHA) ligands, which promote reactivity under mild conditions and control enantioselectivity. The counteranions in the solvent medium, hexafluoroacetylacetate
An Efficient Approach for 3,3-Disubstituted Oxindoles Synthesis: Aryl Iodine Catalyzed Intramolecular C–N Bond Oxidative Cross-Coupling
作者:Yang Wang、Mo Yang、Yuan-Yuan Sun、Zheng-Guang Wu、Hong Dai、Shuhua Li
DOI:10.1021/acs.orglett.1c03224
日期:2021.11.19
Herein, we report the first intramolecular C–N bond formation of phenylpropanamide derivatives via organocatalytic oxidative reactions, affording 3,3-disubstituted oxindole derivatives with up to 99% yield. The high efficiency of this reaction is exemplified by the transition metal-free mild conditions and the ability to perform the reaction on a gram scale. Meanwhile, the DFT calculation of the catalytic