Synthesis of methyl (5Z, 8Z, 11Z, 14Z, 17E)-eicosapentaenoate and methyl (4Z, 7Z, 10Z, 13Z, 16Z, 19E)-docosahexaenoate
作者:Jean-Michel Vatèle、Huynh Dong Doan、Jean-Michel Chardigny、Jean-Louis Sébédio、André Grandgirard
DOI:10.1016/0009-3084(94)90059-0
日期:1994.12
(3Z,6Z,9Z,12E)-Pentadecatetraenal, a common intermediate in the synthesis of methyl Delta 17t EPA and methyl Delta 19t DHA, was obtained by copper(I)-catalyzed coupling between the Grignard reagent of 1,1-diethoxy-3-butyne and (Z,E)-1-bromo-5,8-undecadien-2-yne followed by semi-hydrogenation of the resulting diendyne. The tetraenic aldehyde was subjected to a Wittig reaction with the ylide of (3-carboxybutyl)triphenylphosphonium bromide or of [6-(2,6,7-trioxabicyclo [2.2.2] octyl)-hex-3-Z-enyl] triphenylphosphonium iodide to give, respectively Delta 17t EPA and the protected Delta 19t DHA in high isomeric purity.
(3Z,6Z,9Z,12E)-十五碳四烯醛(亦称为pentadecatetraenal),在合成甲基Δ17t EPA和甲基Δ19t DHA的过程中是一个常见的中间体,它通过将格氏试剂(由1,1-二乙氧基-3-丁炔生成)与(Z,E)-1-溴-5,8-十一碳二烯-2-炔,在铜(I)催化剂的催化下进行偶联反应,随后对生成的二烯炔产物进行半加氢反应而获得。该四烯醛与由(3-羧甲基丁基)三苯基溴化鳞生成的叶立德,或者与由[6-(2,6,7-三氧杂双环[2.2.2]辛基)-3Z-己烯基]三苯基碘化鳞生成的叶立德分别进行Wittig反应,分别生成高立体异构纯度的Δ17t EPA和保护型的Δ19t DHA。