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【结 构 式】

【分子编号】41802

【品名】tert-butyl 2-cyclopentyl-2-(4-methylphenyl)acetate

【CA登记号】

【 分 子 式 】C18H26O2

【 分 子 量 】274.40324

【元素组成】C 78.79% H 9.55% O 11.66%

与该中间体有关的原料药合成路线共 1 条

合成路线1

该中间体在本合成路线中的序号:(XIV)

Reaction of 4,6-dimethylpyridin-2-amine (I) with isoamyl nitrite and HCl gives 2-chloro-4,6-dimethylpyridine (II), which is treated with hydrazine in diethylene glycol at 140 C yielding 2-hydrazino-4,6-dimethylpyridine (III). Cyclization of (III) with cyclohexanone (IV) in refluxing diethylene glycol affords the tetrahydro-alpha-carboline (V), which is dehydrogenated with Pd in refluxing diethylene glycol, giving the alpha-carboline (VI). The alkylation of (VI) with the benzyl bromide (VII) by means of potassium tert-butoxide in DMF yields the adduct (VIII), which is hydrolyzed with concentrated H2SO4 to provide the carboxylic acid (IX). Finally, this acid is condensed with (R)-2-hydroxy-1-phenylethylamine (X) by means of HOBT and EDC in CH2Cl2, giving a diastereomeric mixture of the corresponding amides that is resolved by column chromatography. The benzyl bromide intermediate (VII) has been obtained as follows: Esterification of 2-(4-methylphenyl)acetic acid (XI) with tert-butanol and DCC and DMAP in CH2Cl2 gives the corresponding tert-butyl ester (XII), which is condensed with cyclopentyl bromide (XIII) by means of t-BuOK in DMF to yield racemic 2-cyclopentyl-2-(4-methylphenyl)acetic acid tert-butyl ester (XIV). Finally, this compound is brominated with NBS and AIBN in refluxing CCl4.

1 Castañer, J.; Silvestre, J.S.; Sorbera, L.A.; Martín, L.; Implitapide. Drugs Fut 2000, 25, 11, 1138.
2 Muller, U.; Connell, R.; Goldmann, S.; Grutzmann, R.; Beuck, M.; Bischoff, H.; Denzer, D.; Domdey-Bette, A.; Wohlfeil, S. (Bayer AG); Cycloalkano-indole- and -azaindole derivs.. CA 2159546; DE 4435477; EP 0705831; JP 1996225526; US 5684014 .
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) 41793 4,6-dimethyl-2-pyridinamine; 4,6-dimethyl-2-pyridinylamine 5407-87-4 C7H10N2 详情 详情
(II) 41794 2-chloro-4,6-dimethylpyridine 30838-93-8 C7H8ClN 详情 详情
(III) 41795 2-hydrazino-4,6-dimethylpyridine C7H11N3 详情 详情
(IV) 11059 Cyclohexanone 108-94-1 C6H10O 详情 详情
(V) 41796 2,4-dimethyl-6,7,8,9-tetrahydro-5H-pyrido[2,3-b]indole C13H16N2 详情 详情
(VI) 41797 2,4-dimethyl-9H-pyrido[2,3-b]indole C13H12N2 详情 详情
(VII) 41798 tert-butyl 2-[4-(bromomethyl)phenyl]-2-cyclopentylacetate C18H25BrO2 详情 详情
(VIII) 41799 tert-butyl 2-cyclopentyl-2-[4-[(2,4-dimethyl-9H-pyrido[2,3-b]indol-9-yl)methyl]phenyl]acetate C31H36N2O2 详情 详情
(IX) 41800 2-cyclopentyl-2-[4-[(2,4-dimethyl-9H-pyrido[2,3-b]indol-9-yl)methyl]phenyl]acetic acid C27H28N2O2 详情 详情
(X) 14376 (2R)-2-amino-2-phenyl-1-ethanol; (R)-(-)-2-phenylglycinol; (R)-2-amino-2-phenyl-1-ethanol 56613-80-0 C8H11NO 详情 详情
(XI) 28316 2-(4-methylphenyl)acetic acid 622-47-9 C9H10O2 详情 详情
(XII) 41801 tert-butyl 2-(4-methylphenyl)acetate C13H18O2 详情 详情
(XIII) 10792 Butanoyl chloride; Butyryl chloride 141-75-3 C4H7ClO 详情 详情
(XIV) 41802 tert-butyl 2-cyclopentyl-2-(4-methylphenyl)acetate C18H26O2 详情 详情
Extended Information