Synthesis of Tricholomic Acid. VIII. Synthesis of Diastereoisomers of Isotricholomic Acid from β-Hydroxyglutamic Acid γ-Esters

Two diastereoisomers of isotricholomic acid (II), structural isomers of tricholomic acid (erythro-L-I) were synthesized from the corresponding diastereoisomers of β-hydroxyglutamic acid γ-ester (V) by the method for the synthesis of I. During the synthesis of II, the diastereoisomers of I were obtained by a novel intramolecular rearrangement.