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【结 构 式】

【分子编号】43792

【品名】4-hydroxy-3-nitrobenzonitrile

【CA登记号】3272-08-0

【 分 子 式 】C7H4N2O3

【 分 子 量 】164.12044

【元素组成】C 51.23% H 2.46% N 17.07% O 29.25%

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)

Reaction of 4-hydroxy-3-nitrobenzaldehyde (I) with hydroxylamine and sodium formate in refluxing formic acid gives 4-hydroxy-3-nitrobenzonitrile (II), which is treated with thioacetamide in hot DMF to yield the corresponding thiobenzamide (III). The cyclization of (III) with 2-chloroacetoacetic acid ethyl ester (IV) in refluxing ethanol affords 2-(4-hydroxy-3-nitrophenyl)-5-methylthiazole-4-carboxylic acid ethyl ester (V), which is alkylated at the phenolic group by means of isobutyl bromide (VI) and K2CO3 in hot DMF, providing the isobutyl ether (VII). The reduction of the NO2 group of (VII) with H2 over Pd/C in ethanol/ethyl acetate gives the expected amino derivative (VIII), which is converted into 2-(3-cyano-4-isobutoxyphenyl)-4-methylthiazole-5-carboxylic acid ethyl ester (IX) by diazotation with NaNO2/HCl and treatment with CuCN and KCN. Finally, this compound is hydrolyzed with NaOH in hot THF.

1 Sorbera, L.A.; Castaner, J.; Rabasseda, X.; Revel, L.; TMX-67. Drugs Fut 2001, 26, 1, 32.
2 Kondo, S.; Fukushima, H.; Hasegawa, M.; Tsuchimoto, M.; Nagata, I.; Osada, Y.; Komoriya, K.; Yamaguchi, H. (Teijin Ltd.); 2-Arylthiazole deriv. and pharmaceutical compsn. containing the same. EP 0513379; JP 1993500083; US 5614520; WO 9209279 .
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) 18372 4-hydroxy-3-nitrobenzaldehyde 3011-34-5 C7H5NO4 详情 详情
(II) 43792 4-hydroxy-3-nitrobenzonitrile 3272-08-0 C7H4N2O3 详情 详情
(III) 43793 4-hydroxy-3-nitrobenzenecarbothioamide C7H6N2O3S 详情 详情
(IV) 21337 ethyl 2-chloro-3-oxobutanoate 609-15-4 C6H9ClO3 详情 详情
(V) 43794 ethyl 2-(4-hydroxy-3-nitrophenyl)-4-methyl-1,3-thiazole-5-carboxylate C13H12N2O5S 详情 详情
(VI) 24599 1-bromo-2-methylpropane 78-77-3 C4H9Br 详情 详情
(VII) 43795 ethyl 2-(4-isobutoxy-3-nitrophenyl)-4-methyl-1,3-thiazole-5-carboxylate C17H20N2O5S 详情 详情
(VIII) 43796 ethyl 2-(3-amino-4-isobutoxyphenyl)-4-methyl-1,3-thiazole-5-carboxylate C17H22N2O3S 详情 详情
(IX) 43797 ethyl 2-(3-cyano-4-isobutoxyphenyl)-4-methyl-1,3-thiazole-5-carboxylate C18H20N2O3S 详情 详情
Extended Information