Influence of Phosphoramidites in Copper-Catalyzed Conjugate Borylation Reaction
摘要:
Copper(I) has become the preferred metal to catalyze the beta-boration of alpha,beta-unsaturated carbonyl compounds, and now we demonstrate that easily accessible monodentate chiral ligands, such as phosphoramidites and phosphites, can be convenient alternative ligands to induce asymmetry in the enantioselective version of this reaction, particularly in the beta-boration of alpha,beta-unsaturated imines.
One-Pot Three-Component Highly Selective Synthesis of Homoallylboronates by Using Metal-Free Catalysis
作者:Ismail Ibrahem、Palle Breistein、Armando Córdova
DOI:10.1002/chem.201103572
日期:2012.4.23
Metal‐free selectivity: The first metal‐free one‐pot three‐component highly chemo‐ and regioselective catalytic synthesis of homoallylboranes using simple N‐heterocyclic carbenes (NHC) and amines is presented. The catalytic reaction between B2(pin)2, α,β‐unsaturated aldehydes and 2‐(triphenylphosphoranylidene)acetate esters proceeds through a catalytic metal‐free β‐boration/Wittig cascade sequence