Diterpenoids. XXXIV. Stereochemistry on the Rearranged Compound (Benzilic Acid Rearrangement) of Methyl 6, 7-Dioxo-5α, 10α-podocarpa-8, 11, 13-trien-15-oate

Abstract

Stereochemistry of the hydroxy diacid (III), which was obtained by the benzilic acid rearrangement of the dioxo ester (II) derived from l-abietic acid (I), was determined uneqivocally. Moreover, the rearranged compounds (III and IX) were concluded to have a nonsteroidal form.