Alkylation reactions of active methylene compounds, alcohols and phenols with alkyl halides in aqueous NaOH solution can be carried out without the need for any added organic solvents in most cases. The water-soluble calix[n]arenes, which contain trimethylammoniomethyl groups on the upper rim, were used as inverse phase-transfercatalysts, resulting in the corresponding alkylated products in good to
Transition metal-free asymmetric and diastereoselective allylic alkylation using Grignard reagents: construction of vicinal stereogenic centers via kinetic resolution
作者:David Grassi、Alexandre Alexakis
DOI:10.1039/c4sc01003e
日期:——
The first transition metal-free diastereoselective and enantioselective asymmetricallylicalkylation (AAA) has been disclosed leading to the construction of vicinal tertiary/quaternary centers via a kinetic resolution protocol starting from readily available starting materials. This procedure is chemically appealing since no consecutive AAA or stereoselective metal-catalyzed/chiral ligand AAAs are