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【结 构 式】

【分子编号】32039

【品名】(3S)-3-ethyl-6-fluoro-3,4-dihydro-2(1H)-quinoxalinone

【CA登记号】

【 分 子 式 】C10H11FN2O

【 分 子 量 】194.2086232

【元素组成】C 61.85% H 5.71% F 9.78% N 14.42% O 8.24%

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:(IV)

The condensation of 2,4-difluoronitrobenzene (I) with 2(S)-aminobutyric acid (II) by means of triethylamine in refluxing acetone gives 2(S)-(5-fluoro-2-nitrophenylamino)butyric acid (III), which is reductocyclized with H2 over Raney-Ni in methanol/acetic acid, yielding 3(S)-ethyl-6-fluoro-1,2,3,4-tetrahydroquinoxalin-2-one (IV). Finally, this compound is treated with isopropyl chloroformate (V) and 4-methylpyridine in dichloromethane.

1 Rosner, M.; Billhardt-Troughton, U.-M.; Kirsch, R.; Kleim, J.-P.; Meichsner, C.; Riess, G.; Winkler, I. (Aventis SA); Quinoxalines, process for their preparation, and their use. CA 2160859; DE 4437406; EP 0708093; JP 1996225544; US 5723461 .
2 Graul, A.; Castañer, J.; Rabasseda, X.; GW-420867X. Drugs Fut 2000, 25, 1, 24.
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) 32036 2,4-difluoro-1-nitrobenzene 446-35-5 C6H3F2NO2 详情 详情
(II) 32037 (2S)-2-aminobutyric acid 1492-24-6 C4H9NO2 详情 详情
(III) 32038 (2S)-2-(5-fluoro-2-nitroanilino)butyric acid C10H11FN2O4 详情 详情
(IV) 32039 (3S)-3-ethyl-6-fluoro-3,4-dihydro-2(1H)-quinoxalinone C10H11FN2O 详情 详情
(V) 26492 2-[(chlorocarbonyl)oxy]propane 108-23-6 C4H7ClO2 详情 详情
Extended Information