Merrifield Resin−C<sub>6</sub>H<sub>4</sub>CH<sub>2</sub>N<sub>3</sub>P(MeNCH<sub>2</sub>CH<sub>2</sub>)<sub>3</sub>N: An Efficient Reusable Catalyst for Room-Temperature 1,4-Addition Reactions and a More Convenient Synthesis of Its Precursor P(MeNCH<sub>2</sub>CH<sub>2</sub>)<sub>3</sub>N
作者:Reddy、John G. Verkade
DOI:10.1021/jo062505z
日期:2007.4.1
donors were efficiently catalyzed at room temperature by the title reusable Merrifield resin-supported catalyst. Advantages of this catalyst include a simple workup (filtration of the reaction mixture) and good to excellent product yields. We also report a substantially simplified synthesis of the commercially available strong nonionic base 1, a precursor to the title polymer-bound catalyst.
A general and efficient protocol for the Michaeladdition reactions of β-ketoesters in pure water has been developed. The reactions are successfully catalyzed by newly designed DMAP-related organocatalysts such as 4-(didecylamino)pyridine, and the desired Michael adducts are obtained in good to high yields