Structure and Synthesis of the Methyl Ester of 3,4-Anhydroshikimic Acid, Isolated from a Chalara Sp.

Abstract
The methyl ester of (+)-3,4-anhydroshikimic acid was isolated from the fungus C. microspora (Corda) Hughes. The structure was elucidated by spectroscopy and was confirmed by synthesis of the title compound and its 5-epimer. Synthesis via a partially resolved intermediate allowed the absolute configuration to be assigned.