Polymer-Assisted Solution-Phase (PASP) Suzuki Couplings Employing an Anthracene-Tagged Palladium Catalyst
作者:Ping Lan、Daniela Berta、John A. Porco、Michael S. South、John J. Parlow
DOI:10.1021/jo035129g
日期:2003.12.1
A general method for polymer-assisted solution-phase (PASP) Suzuki reactions employing a combination of anthracene-tagged palladium catalyst and anthracene-tagged boronic acid with a polymer-supported carbonate base is reported. The anthracene-tagged catalyst allows for the easy removal of the Pd catalyst along with the dissociated phosphine ligand and phosphine oxide byproducts by sequestration through a chemoselective Diels-Alder reaction with a maleimide resin. The polymer-supported carbonate base facilitates the removal of excess boronic acid and the borane-containing byproducts present at the end of the coupling reaction. The Suzuki coupling reaction can be efficiently conducted by using combinations of the anthracene-tagged Pd catalyst, polymer-supported carbonate base, and anthracene-tagged boronic acid to yield the desired product in high purity and yield without the use of chromatography.
BICYCLIC IMIDAZOLO DERIVATIVE
申请人:Sumitomo Dainippon Pharma Co., Ltd.
公开号:US20180044343A1
公开(公告)日:2018-02-15
Disclosed are compounds, having the following structure, useful as inhibitors of Phosphodiesterase 1 (PDE1), compositions comprising the compounds, and methods of using the same.
Tunable Unsymmetrical Ferrocene Ligands Bearing a Bulky Di-1-adamantylphosphino Motif for Many Kinds of C<sub>sp<sup>2</sup></sub>–C<sub>sp<sup>3</sup></sub> Couplings