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【结 构 式】

【分子编号】58772

【品名】2,6-difluoro-N-hydroxybenzamide

【CA登记号】

【 分 子 式 】C7H5F2NO2

【 分 子 量 】173.1190464

【元素组成】C 48.57% H 2.91% F 21.95% N 8.09% O 18.48%

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:(II)

Methyl 2,6-difluorobenzoate (I) was converted to the hydroxamic acid (II) upon treatment with hydroxylamine and KOH. Cyclization of the fluorobenzohydroxamic acid (II) using KOH in boiling butanol produced the 3-hydroxybenzisoxazole (III), which was subjected to Mitsunobu coupling with N-Boc-ethanolamine (IV) to furnish the N-Boc-aminoethyl ether (V). Metalation of (V) with butyllithium at -70 C, followed by quenching with iodomethane gave rise to two regioisomeric methylbenzisoxazoles (VI) and (VII), which were separated by column chromatography. The target 7-methyl benzisoxazole (VII) was then deprotected under acidic conditions to yield the title aminoethoxy derivative.

1 Kojima, K.; Aizawa, Y.; Kaneko, I.; Sakai, J.; Kozuka, M.; Koyama, K.; Samata, N.; Yoshimi, K. (Sankyo Co., Ltd.); Isoxazoles. EP 0779281; JP 1997059264; US 5965591; US 6096771; WO 9606837 .
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) 58771 2,6-Difluorobenzoic acid methyl ester; Methyl 2,6-difluorobenzoate 13671-00-6 C8H6F2O2 详情 详情
(II) 58772 2,6-difluoro-N-hydroxybenzamide C7H5F2NO2 详情 详情
(III) 58773 4-fluoro-1,2-benzisoxazol-3-ol C7H4FNO2 详情 详情
(IV) 32500 tert-butyl 2-hydroxyethylcarbamate 26690-80-2 C7H15NO3 详情 详情
(V) 58774 tert-butyl 2-[(4-fluoro-1,2-benzisoxazol-3-yl)oxy]ethylcarbamate C14H17FN2O4 详情 详情
(VI) 58775 tert-butyl 2-[(4-fluoro-5-methyl-1,2-benzisoxazol-3-yl)oxy]ethylcarbamate C15H19FN2O4 详情 详情
(VII) 58776 tert-butyl 2-[(4-fluoro-7-methyl-1,2-benzisoxazol-3-yl)oxy]ethylcarbamate C15H19FN2O4 详情 详情
Extended Information