First enantiospecific synthesis of a 3,4-dihydroxy- l -glutamic acid [(3 S ,4 S )-DHGA], a new mGluR1 agonist

Bioorganic & Medicinal Chemistry Letters
2000.0

Abstract

The first synthesis of one of the 4 possible stereoisomers of 3,4-dihydroxy-L-glutamic acid ((3S,4S)-DHGA 3), a natural product of unknown configuration, is described. The synthesis is based on the Lewis acid catalyzed reaction of benzyl alcohol with a D-ribose-derived 2,3-aziridino-gamma-lactone 4-benzyl carboxylate (6). Preliminary pharmacological studies showed that (3S,4S)-3 is an agonist of metabotropic glutamate receptors of type 1 (mGluR1) and a weak antagonist of mGluR4 but has no discernible activity with respect to mGluR2. This activity profile can be rationalized by fitting extended conformations of (3S,4S)-3 in proposed models of each of these receptor subtypes.

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