Synthesis of (9Z,12Z,15E)- and (9E,12Z,15Z)-octadecatrienoic acids and their [1-14C]-radiolabelled analogs
摘要:
In order to study the effect of the double bonds geometry of linolenic acid (18:3 n-3) on its biological activities, (9Z,12Z,15E)- and (9E,12Z,15Z)-octadecatrienoic acids, found in many refined vegetable oils, were made by total synthesis. Synthesis of 18:3 Delta 9c, 12c, 15t involves a Wittig reaction between 3-(2-tetrahydropyranyloxy)-propylphosphonium salt and (E)-3-hexenal which gave (3Z,6E)-1-(2-tetrahydropyranyloxy)-nonadiene in 66% yield. The transformation of the ether function to a phosphonium salt, followed by a Wittig reaction with 8-(t-butyldimethylsilyloxy)-octanal afforded a C17 trienic ether. A one-carbon homologation of its corresponding bromide with potassium cyanide followed by hydrolysis in basic medium furnished 18:3 Delta 9c, 12c, 15t in high isomeric purity and high radiochemical purity for its [1-C-14]-labelled analog. In the synthesis of 18:3 Delta 9t, 12c, 15c, a Wittig reaction between (E)-6-(2-tetrahydropyranyloxy)-hex-3-enylphosphonium salt, obtained in three steps from 6-(2-tetrahydropyranyloxy)-hex-3-yn-l-ol and (Z)-3-hexenal afforded a C12 (E,Z,Z)-trienic ether. After a six-carbon homologation of this ether, in three steps, the resulting nitrile was hydrolyzed to (9E,12Z, 15Z)-octadecatrienoic acid (99% purity) (99% radiochemical purity of its [1-C-14]-labelled analog).
Synthetic studies on diterpenes from a termite soldier: Total synthesis of (±)-biflora-4,10(19),15-triene
作者:Paul A. Grieco、Ravi P. Nargund
DOI:10.1016/s0040-4039(00)85070-4
日期:1986.1
The total synthesis of (±)-biflora-4,10(19),15-triene is detailed which features a Diels-Alder strategy for elaboration of the four contiguous stereocenters at C(1), C(6), C(7), and C(11).
Sex pheromone of the white peach scale: highly stereoselective synthesis of the stereoisomers of pentagonol propionate
作者:R. R. Heath、R. E. Doolittle、P. E. Sonnet、J. H. Tumlinson
DOI:10.1021/jo01302a032
日期:1980.7
US4672075A
申请人:——
公开号:US4672075A
公开(公告)日:1987-06-09
US4673685A
申请人:——
公开号:US4673685A
公开(公告)日:1987-06-16
[EN] UNSATURATED FATTY ACIDS AND THEIR USES IN THERAPY<br/>[FR] ACIDES GRAS INSATURES ET UTILISATIONS THERAPEUTIQUES
申请人:COMMW SCIENT IND RES ORG
公开号:WO2001046115A1
公开(公告)日:2001-06-28
This invention relates to a method for the treatment or prevention of coronary heart disease including the step of administering a polyunsaturated fatty acid or derivative thereof, said polyunsaturated fatty acid including: a linear chain of 18 carbon atoms, and two or more double bonds in the linear chain, wherein said polyunsaturated fatty acid is an n-1, n-2, n-3, n-4 or n-5 fatty acid, but excluding 183n-3 (Δ9,12,15) .