Total synthesis, elucidation of absolute stereochemistry, and adjuvant activity of trihydroxy fatty acids
摘要:
Pinellic acid from the tuber of Pinellia ternate, an active herbal component of the traditional Japanese herbal (Kampo) medicine Sho-seiryu-to, is a C18 trihydroxy fatty acid whose absolute stereochernistry has now been determined. All stereoisomers of pinellic acid were synthesized via regioselective asymmetric dihydroxylation, regioselective inversion, and stereoselective reduction in order to determine their absolute stereochemistries and adjuvant activities. Among this series of isomers, the (9S,12S,13S)-compound, which is a natural product, exhibited the most potent adjuvant activity. Spectral data for all of the stereoisomers of the 1,2-allylic diols were compared and related to their stereochemistries. (c) 2006 Published by Elsevier Ltd.
Stereoselective total synthesis of (+)-pinellic acid from l-(+)-tartaric acid
作者:Kavirayani R. Prasad、Bandita Swain
DOI:10.1016/j.tetasy.2008.04.015
日期:2008.5
The stereoselective total synthesis of (+)-pinellic acid, a natural product used in the treatment of influenza, was accomplished from l-(+)-tartaricacid. A key feature of the synthesis includes the elaboration of a γ-hydroxybutyramide derived from l-(+)-tartaricacid.
Pinellic acid is a novel and potentially useful oral adjuvant when used in conjunction with intranasal inoculation of influenza HA vaccines. All stereoisomers of pinellic acid have been synthesized via regioselective asymmetric dihydroxylation, regioselective inversion, and stereoselective reduction, and their adjuvant activities were characterized. Among this series of isomers, 9S, 12S, 13S compound
A straightforward strategy for the synthesis of (+)-pinellic acid in 16% overall yield and 13 steps, starting from (1R)-1-(furan-2-yl)hexan-1-ol, is described. Key reactions in the synthesis include a Sharpless kinetic resolution, oxidation of a protected furan to reveal a but-2-ene-1,4-dione moiety, and an asymmetric reduction.
Kato, Tadahiro; Yamaguchi, Yoshihiro; Hirukawa, Toshifumi, Agricultural and Biological Chemistry, 1991, vol. 55, # 5, p. 1349 - 1357