Abstract
The asymmetric synthesis of the antitumor and immunostimulatory α-d-galactosyl ceramide KRN7000 using a (R)-proline-catalyzed enantioselective
aldol reaction as key step is described. The title compound is synthesized
in thirteen linear steps with excellent stereoselectivity (de >98%,
ee = 95%) employing the commercially
available substrates 1-pentadecanal, 2,2-dimethyl-1,3-dioxan-5-one,
hexacosanoic acid, and d-galactose.
Key words
α-galactosyl ceramide - asymmetric synthesis - aldol reaction - organocatalysis -
proline