enantioselective Pd(II)-catalyzed intramolecularoxidative amination reaction was developed utilizing the commercially available chiral X-type ligand (1S)-(+)-camphorsulfonic acid. The Wacker-type cyclization produced chiral indoline products with enantioselectivies up to 45% ee. Electronic structure calculations employing density functional theory support a trans-aminopalladation mechanism.
A method for the preparation of indolines via palladium-catalyzed aerobic intramolecular allylic CH activation was developed. Oxygen was successfully used as oxidant with catalytic amount of 1,4-benzoquinone. 16 examples were reported, the majority of substrates gave moderate to good yields.
Synthesis of nitrogen heterocycles via Pd-catalyzed cross-coupling of o-alkenyl anilides with vinylic halides and triflates
作者:Richard C. Larock、Paola Pace、Hoseok Yang、Charles E. Russell、Sandro Cacchi、Giancarlo Fabrizi
DOI:10.1016/s0040-4020(98)00589-4
日期:1998.8
The palladium-catalyzed cross-coupling of o-allylic and o-vinylic anilides with vinylic halides and triflates produces substituted nitrogen heterocycles in good to high yields by a process involving vinylpalladium addition to the olefin, rearrangement to a π-allylpalladium intermediate and subsequent intramolecular nucleophilic displacement of palladium. Different reactivity and regioselectivity in the
Aerobic Intramolecular Oxidative Amination of Alkenes Catalyzed by NHC-Coordinated Palladium Complexes
作者:Michelle M. Rogers、Johanna E. Wendlandt、Ilia A. Guzei、Shannon S. Stahl
DOI:10.1021/ol060327q
日期:2006.5.1
[reaction: see text] Palladium(II) complexes bearing a single N-heterocyclic carbene ligand serve as effective catalysts for the aerobic oxidative cyclization of alkenes with pendant sulfonamides. The use of carboxylic acid cocatalysts (AcOH and PhCO(2)H) often leads to significant improvements in catalyst stability and product yield and enables catalytic turnover to be achieved with air, rather than