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【结 构 式】

【分子编号】44343

【品名】ethyl 4-amino-1-methyl-3-propyl-1H-pyrazole-5-carboxylate

【CA登记号】

【 分 子 式 】C10H17N3O2

【 分 子 量 】211.264

【元素组成】C 56.85% H 8.11% N 19.89% O 15.15%

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:(XII)

Synthesis of the aminopyrazole intermediate (XIII): The reaction of butanal (I) with methylhydrazine (II) in dichloromethane in the presence of MgSO4 gives the corresponding hydrazide (III), which is alkylated with ethyl bromoacetate (IV) by means of the polymer-supported base 2-(tert-butylimino)-2-(diethylamino)-1,3-dimethylperhydro-1,3,2-diazaphosphorine (PS-BEMP) (V) and polymer-supported methylamine (VI) to yield the hydrazino ester (VII). Treatment of compound (VII) with an ion exchange tetramethylammonium cyanide resin (VIII) in refluxing ethanol containing a catalytic amount of HOAc affords the adduct (IX), which is dehydrogenated with Pd/C/cyclopentene or MnO2 and treated with a polymer-supported ethyl isocyanate resin (X) in order to eliminate the unreacted product, providing the hydrazone (XI). Cyclization of (XI) by means of PS-BEMP (V) in ethanol gives 4-amino-1-methyl-3-propyl-1H-pyrazole-5-carboxylic acid ethyl ester (XII), which is finally treated with ammonia in methanol to afford the desired pyrazolecarboxamide intermediate (XIII).

1 Baxendale, I.R.; Ley, S.V.; Polymer-supported reagents for multi-step organic synthesis: Application to the synthesis of sildenafil. Bioorg Med Chem Lett 2000, 10, 17, 1983.
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) 23694 butyraldehyde 123-72-8 C4H8O 详情 详情
(II) 12091 1-Methylhydrazine; Monomethyl hydrazine 60-34-4 CH6N2 详情 详情
(III) 44339 butanal N-methylhydrazone C5H12N2 详情 详情
(IV) 16640 Ethyl 2-bromoacetate; Ethyl bromoacetate 105-36-2 C4H7BrO2 详情 详情
(V) 44344 N-(tert-butyl)-N-[2-(diethylamino)-1,3-dimethyl-1,3,2lambda(5)-diazaphosphinan-2-ylidene]amine; 2-(tert-butylimino)-N,N-diethyl-1,3-dimethyl-1,3,2lambda(5)-diazaphosphinan-2-amine C13H31N4P 详情 详情
(VI) 11021 Methanamine; Methylamine 74-89-5 CH5N 详情 详情
(VII) 44340 ethyl 2-[2-[(E)butylidene]-1-methylhydrazino]acetate C9H18N2O2 详情 详情
(VIII) 44345 N,N,N-trimethylmethanaminium cyanide C5H12N2 详情 详情
(IX) 44341 ethyl 2-[2-(1-cyanobutyl)-1-methylhydrazino]acetate C10H19N3O2 详情 详情
(X) 11019 (Methylimino)(oxo)methane; methyl isocyanate C2H3NO 详情 详情
(XI) 44342 ethyl 2-[2-[(Z)-1-cyanobutylidene]-1-methylhydrazino]acetate C10H17N3O2 详情 详情
(XII) 44343 ethyl 4-amino-1-methyl-3-propyl-1H-pyrazole-5-carboxylate C10H17N3O2 详情 详情
(XIII) 15627 4-amino-1-methyl-3-propyl-1H-pyrazole-5-carboxamide; 4-amino-1-methyl-3-propyl-5-pyrazolecarboxamide 139756-02-8 C8H14N4O 详情 详情
Extended Information