B. Thierry et al., Solution- and solid-phase approaches in asymmetric phase-transfer catalysis by cinchona alkaloid derivatives, SYNTHESIS-S, (11), 2001, pp. 1742-1746
The catalytic asymmetric alkylation under phase-transfer conditions of vari
ous substrates (enones, alpha -fluoro ketones, glycine-imines) promoted by
chiral quaternary ammonium salts derived from cinchona alkaloids is describ
ed. A solvent-free phase-transfer catalysis is presented as well as a new t
ype of polymer-supported phase-transfer catalyst derived from cinchona alka
loids.