Palladium-catalyzed oxidative arylacetoxylation of alkenes: synthesis of indole and indoline derivatives
作者:Shuklachary Karnakanti、Zhong-Lin Zang、Sheng Zhao、Pan-Lin Shao、Ping Hu、Yun He
DOI:10.1039/c7cc06448a
日期:——
A method for oxidative arylacetoxylation of alkenes has been developed to synthesize indole and indoline derivatives from readily accessible substrates. The cinnamyl tethered anilines with picolinamide as a directing group provided 3-substituted indoles via intramolecular oxidative arylacetoxylation, and the 2-methyl substituted cinnamyl anilines furnished indoline derivatives with 3-position quaternary
mechanistic investigations, including (1)H and (31)P(1)H} NMR studies; isolation and characterization of several catalytic intermediates, Pt(xantphos)Cl(2), Pt(eta(2)-C(3)H(5)OH)(xantphos), etc; confirmation of the structure of [Pt(eta(3)-allyl)(xantphos)]OTf by X-ray crystallographic analysis; and crossover experiments, suggested that formation of the pi-allylplatinum complex through the elimination of water
DDQ-Mediated Cross-Dehydrogenative-Coupling Reaction of Secondary Amines with Dialkyl Phosphonates
作者:Ming-Xing Cheng、Jing-Wei Lei、Cai-Xia Xie
DOI:10.1055/s-0037-1611362
日期:2019.1
This work reports a DDQ-mediated cross-dehydrogenative-coupling reaction of secondary amines with dialkyl phosphonates under mild conditions. This reaction proceeds efficiently without involving visible light or transition-metal catalysis. This new approach provides efficient access to biologically important α-aminophosphonates.
作者:Polpum Onnuch、Kranthikumar Ramagonolla、Richard Y. Liu
DOI:10.1126/science.adl5359
日期:2024.3
The Suzuki–Miyaura and Buchwald–Hartwig coupling reactions are widely used to form carbon-carbon (C–C) and carbon-nitrogen (C–N) bonds, respectively. We report the incorporation of a formal nitrene insertion process into the Suzuki–Miyaura reaction, altering the products from C–C–linked biaryls to C–N–C–linked diaryl amines and thereby joining the Suzuki–Miyaura and Buchwald–Hartwig coupling pathways
The first palladium catalyst system that allows the direct allylation of indoles with allylic alcohols as substrates with water being the only byproduct is presented. The application of self-assembing ligands based on complementary hydrogen bonding was the key to success.