Total Synthesis of the Eight Diastereomers of the Syn-Anti-Syn Phytoprostanes F1 Types I and II
摘要:
Syntheses of the eight enantiomerically pure diastereomers of the syn-anti-syn phytoprostanes F-1 types I and II are described starting from D- and L-glucose. Key steps include Wittig coupling, Horner Wadsworth Emmons (HWE) reactions, and enantioselective reduction of alpha,beta-unsaturated ketones.
Syntheses of the four enantiomerically pure diastereoisomers of the phytoprostanes E1 type II and 15-E2t-isoprostanes (1−4) are described. The key steps included the preparation of the Freïmanis (±)-hydroxycyclopentenone 5, enzymatic resolution of this racemic hydroxycyclopentenone, Wittig and Horner−Wadsworth−Emmons (HWE) coupling reactions and finally enantioselective reductions.
Phytofurans (PhytoFs) are produced in plants and seeds by a non‐enzymatic free‐radical mechanism from α‐linolenic acid. The synthesis of some phytofurans is described. The phytofurans were also quantitated for the first time in the liver tissue of rats.