Asymmetric Synthesis of the α-d-Galactosyl Ceramide KRN7000 via an Organocatalytic
Aldol Reaction as Key Step

Dieter Enders; Violeta Terteryan; Jiří Paleček

doi:10.1055/s-0029-1218844

PAPER

Asymmetric Synthesis of the α-d-Galactosyl Ceramide KRN7000 via an Organocatalytic Aldol Reaction as Key Step

Dieter Enders*, Violeta Terteryan, Jiří Paleček
Institute of Organic Chemistry, RWTH Aachen University, Landoltweg 1, 52074 Aachen, Germany
Fax: +49(241)8092127; e-Mail: enders@rwth-aachen.de;

Abstract

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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

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