Stereochemical aspects of catalytic hydrogenation of 2,3-di- and 2,3,4-tri-substituted 2-cyclopentene-1-ones and reactivity of the resulting cyclopentanones
Enzymatic kinetic resolution of a functionalized 4-hydroxy-cyclopentenone: synthesis of the key intermediates in the total synthesis of isoprostanes
摘要:
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.
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.
Stereochemical aspects of catalytic hydrogenation of 2,3-di- and 2,3,4-tri-substituted 2-cyclopentene-1-ones and reactivity of the resulting cyclopentanones
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.