The enzymatic kinetic resolution of racemic alcohol 4-hydroxy-cyclopentenone 1 was investigated using four different lipases for enantioselective transacetylation, as well as for enantioselective hydrolysis, leading to the pure (R)- and (S)-enantiomers 2 and 3. (c) 2005 Elsevier Ltd. All rights reserved.
Total Synthesis of the Four Enantiomerically Pure Diasteroisomers of the Phytoprostanes E<sub>1</sub>Type II and of the 15-E<sub>2t</sub>-Isoprostanes
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.