【结 构 式】 |
【分子编号】39591 【品名】3-[(1E,3E,5E,7E)-3,7-dimethyl-9-oxo-1,3,5,7-nonatetraenyl]-2,4,4-trimethyl-2-cyclohexen-1-yl acetate 【CA登记号】 |
【 分 子 式 】C22H30O3 【 分 子 量 】342.4784 【元素组成】C 77.16% H 8.83% O 14.01% |
合成路线1
该中间体在本合成路线中的序号:(XVI)The reaction of vitamin A aldehyde (retinene) (XV) with NBS and acetic acid - acetic anhydride in CHCl3 gives 3-acetoxyretinene (XVI), which is reduced with NaBH4 in methanol to yield 3-acetoxyretinol (XVII). The reaction of (XVII) with triphenylphosphine and HCl in methanol affords 3-acetoxyretinyltriphenylphosphonium chloride (XVIII), which is condensed through a Wittig reaction with aldehyde (XVI) by means of sodium methoxide in isopropanol giving trans-isozeaxanthin (XIX). Finally, this compound is oxidized with aluminum isopropoxide in refluxing benzene - acetone.
【1】 Surmatis, J.D.; et al.; Synthesis of oxygenated carotenoids. Helv Chim Acta 1970, 53, 5, 974-990. |
【2】 Surmatis, J.D.; US 3311656 . |
【3】 Serradell, M.N.; Blancafort, P.; Castaner, J.; Hillier, K.; Canthazanthin. Drugs Fut 1979, 4, 7, 477. |
中间体序号 | 中间体编号 | 品名 | CAS号 | 分子式 | 供应商 | 用于合成 |
---|---|---|---|---|---|---|
(XV) | 39590 | (2E,4E,6E,8E)-3,7-dimethyl-9-(2,6,6-trimethyl-1-cyclohexen-1-yl)-2,4,6,8-nonatetraenal | C20H28O | 详情 | 详情 | |
(XVI) | 39591 | 3-[(1E,3E,5E,7E)-3,7-dimethyl-9-oxo-1,3,5,7-nonatetraenyl]-2,4,4-trimethyl-2-cyclohexen-1-yl acetate | C22H30O3 | 详情 | 详情 | |
(XVII) | 39592 | 3-[(1E,3E,5E,7E)-9-hydroxy-3,7-dimethyl-1,3,5,7-nonatetraenyl]-2,4,4-trimethyl-2-cyclohexen-1-yl acetate | C22H32O3 | 详情 | 详情 | |
(XVIII) | 39593 | [(2E,4E,6E,8E)-9-[3-(acetoxy)-2,6,6-trimethyl-1-cyclohexen-1-yl]-3,7-dimethyl-2,4,6,8-nonatetraenyl](triphenyl)phosphonium chloride | C40H46ClO2P | 详情 | 详情 | |
(XIX) | 39594 | 3-[(1E,3E,5E,7E,9E,11E,13E,15E,17E)-18-(3-hydroxy-2,6,6-trimethyl-1-cyclohexen-1-yl)-3,7,12,16-tetramethyl-1,3,5,7,9,11,13,15,17-octadecanonaenyl]-2,4,4-trimethyl-2-cyclohexen-1-ol | C40H56O2 | 详情 | 详情 |
合成路线2
该中间体在本合成路线中的序号:(XVI)The reduction of retinene (XV) with NaBH4 in methanol gives retinol (XX), which by reaction with triphenylphosphine and H2SO4 is converted into retinyltriphenylphosphonium sulfate (XXI). The Wittig reaction of (XXI) with aldehyde (XVI) by means of sodium methoxide in benzene - methanol yields 3-acetylisocryptoxanthin (XXII), which by reaction with aqueous 68% HBr in methylene chloride, followed by a treatment with Na2CO3 affords dehydro-retro-carotene (XXIII).
【1】 Surmatis, J.D.; et al.; Synthesis of oxygenated carotenoids. Helv Chim Acta 1970, 53, 5, 974-990. |
【2】 Serradell, M.N.; Blancafort, P.; Castaner, J.; Hillier, K.; Canthazanthin. Drugs Fut 1979, 4, 7, 477. |
中间体序号 | 中间体编号 | 品名 | CAS号 | 分子式 | 供应商 | 用于合成 |
---|---|---|---|---|---|---|
(XV) | 39590 | (2E,4E,6E,8E)-3,7-dimethyl-9-(2,6,6-trimethyl-1-cyclohexen-1-yl)-2,4,6,8-nonatetraenal | C20H28O | 详情 | 详情 | |
(XVI) | 39591 | 3-[(1E,3E,5E,7E)-3,7-dimethyl-9-oxo-1,3,5,7-nonatetraenyl]-2,4,4-trimethyl-2-cyclohexen-1-yl acetate | C22H30O3 | 详情 | 详情 | |
(XX) | 39595 | (2E,4E,6E,8E)-3,7-dimethyl-9-(2,6,6-trimethyl-1-cyclohexen-1-yl)-2,4,6,8-nonatetraen-1-ol | 68-26-8 | C20H30O | 详情 | 详情 |
(XXI) | 39596 | [(2E,4E,6E,8E)-3,7-dimethyl-9-(2,6,6-trimethyl-1-cyclohexen-1-yl)-2,4,6,8-nonatetraenyl](triphenyl)phosphonium hydrogen sulfate | C38H45O4PS | 详情 | 详情 | |
(XXII) | 39597 | 2,4,4-trimethyl-3-[(1E,3E,5E,7E,9E,11E,13E,15E,17E)-3,7,12,16-tetramethyl-18-(2,6,6-trimethyl-1-cyclohexen-1-yl)-1,3,5,7,9,11,13,15,17-octadecanonaenyl]-2-cyclohexen-1-yl acetate | C42H58O2 | 详情 | 详情 | |
(XXIII) | 39598 | 1,5,5-trimethyl-6-[(Z,2E,4E,6E,8E,10E,12E,14E,16E)-3,7,12,16-tetramethyl-18-(2,6,6-trimethyl-2-cyclohexen-1-ylidene)-2,4,6,8,10,12,14,16-octadecaoctaenylidene]-1-cyclohexene | C40H54 | 详情 | 详情 |