【结 构 式】 |
【药物名称】13-cis-retinoic acid, Isotretinoin, Ro-43780, Amnesteem, Claravis, Roacutan, Roaccutan, Roaccutane, Accutane 【化学名称】13-cis-Retinoic acid 【CA登记号】4759-48-2, 22232-80-0 (K salt), 13497-05-7 (Na salt) 【 分 子 式 】C20H28O2 【 分 子 量 】300.44496 |
【开发单位】Roche (Originator), Bertek (Not Determined), Barr (Generic) 【药理作用】Acne Therapy, DERMATOLOGIC DRUGS, Retinoids |
合成路线1
The reaction of vinyl-beta-ionol (I) with triphenylphosphonium bromide (II) in ethanol gives the corresponding phosphonium salt (III), which is condensed through a Wittig reaction with cis-beta-formylcrotonic acid (IV) by means of sodium ethoxide in ethanol to afford a mixture of cis-2-cis-4-vitamin A acid (V) and the desired product. Finally, compound (V) is isomerized bv irradiation with diffuse light in ether in the presence of iodine.
【1】 Garbers, C.F.; et al.; Synthesis of cis-2, cis-4-vitamin A by a Wittig condensation. J Chem Soc 1968, 16, 1982-83. |
【2】 Castaner, J.; Serradell, M.N.; Hillier, K.; Blancafort, P.; Isotretinoin. Drugs Fut 1979, 4, 9, 651. |
中间体序号 | 中间体编号 | 品名 | CAS号 | 分子式 | 供应商 | 用于合成 |
---|---|---|---|---|---|---|
(I) | 33333 | (2E,4E)-3-methyl-5-(2,6,6-trimethyl-1-cyclohexen-1-yl)-2,4-pentadien-1-ol | 3917-39-3 | C15H24O | 详情 | 详情 |
(III) | 33334 | [(2E,4E)-3-methyl-5-(2,6,6-trimethyl-1-cyclohexen-1-yl)-2,4-pentadienyl](triphenyl)phosphonium bromide | C33H38BrP | 详情 | 详情 | |
(IV) | 33335 | (Z)-3-methyl-4-oxo-2-butenoic acid | C5H6O3 | 详情 | 详情 | |
(V) | 32679 | (2E,4E,6E,8E)-3,7-dimethyl-9-(2,6,6-trimethyl-1-cyclohexen-1-yl)-2,4,6,8-nonatetraenoic acid; Retinoic acid | 302-79-4 | C20H28O2 | 详情 | 详情 |
合成路线2
The formylation of the beta-ionone (I) with methyl formate and NaOMe gives the enol (II), which by reaction with methanol and H2SO4 yields the dimethylacetal (III). The reaction of (III) with methylenetriphenylphosphorane (IV) affords the methylene compound (V), which is treated with formic acid to provide the aldehyde (VI). The condensation of (VI) with isopropylidenemalonic acid dimethyl ester (VII) by means of NaOH gives the polyenic malonic acid (VIII) as a mixture of isomers that is separated by crystallization in ethyl ether to yield the desired all-trans-isomer (IX). Finally, this malonic acid is selectively monodecarboxylated by means of refluxing 2,6-dimethylpyridine to afford the target (E,E,E,Z)-isomer.
【1】 Valia, A.; et al.; Stereoselective synthesis of 13 E retinoic and 13 Z retinoic acids via a new intermediate compound, C-15 beta-methylenealdehyde. Tetrahedron 2000, 56, 37, 7211. |
中间体序号 | 中间体编号 | 品名 | CAS号 | 分子式 | 供应商 | 用于合成 |
---|---|---|---|---|---|---|
(VIIIa),(IX) | 49672 | 2-[(2E,4E,6E)-1,5-dimethyl-7-(2,6,6-trimethyl-1-cyclohexen-1-yl)-2,4,6-heptatrienylidene]malonic acid | C21H28O4 | 详情 | 详情 | |
(VIIb) | 49673 | 2-[(2E,4Z,6E)-1,5-dimethyl-7-(2,6,6-trimethyl-1-cyclohexen-1-yl)-2,4,6-heptatrienylidene]malonic acid | C21H28O4 | 详情 | 详情 | |
(I) | 39584 | (E)-4-(2,6,6-trimethyl-1-cyclohexen-1-yl)-3-buten-2-one | 14901-07-6 | C13H20O | 详情 | 详情 |
(II) | 49667 | (1E,4E)-1-hydroxy-5-(2,6,6-trimethyl-1-cyclohexen-1-yl)-1,4-pentadien-3-one | C14H20O2 | 详情 | 详情 | |
(III) | 49668 | (E)-5,5-dimethoxy-1-(2,6,6-trimethyl-1-cyclohexen-1-yl)-1-penten-3-one | C16H26O3 | 详情 | 详情 | |
(IV) | 27301 | methylene(triphenyl)phosphorane | C19H17P | 详情 | 详情 | |
(V) | 49669 | (E)-1-methoxy-3-methylene-5-(2,6,6-trimethyl-1-cyclohexen-1-yl)-4-pentenyl methyl ether; 2-[(1E)-3-(2,2-dimethoxyethyl)-1,3-butadienyl]-1,3,3-trimethyl-1-cyclohexene | C17H28O2 | 详情 | 详情 | |
(VI) | 49670 | (E)-3-methylene-5-(2,6,6-trimethyl-1-cyclohexen-1-yl)-4-pentenal | C15H22O | 详情 | 详情 | |
(VII) | 49671 | dimethyl 2-(1-methylethylidene)malonate | 22035-53-6 | C8H12O4 | 详情 | 详情 |