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【结 构 式】

【分子编号】44394

【品名】methyl 8-chloro-6-(2-fluorophenyl)-1-methyl-4H-imidazo[1,5-a][1,4]benzodiazepine-3-carboxylate

【CA登记号】

【 分 子 式 】C20H15ClFN3O2

【 分 子 量 】383.8092232

【元素组成】C 62.59% H 3.94% Cl 9.24% F 4.95% N 10.95% O 8.34%

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:(X)

The reaction of 7-chloro-5-(2-fluorophenyl)-2,3-dihydro-1H-1,4-benzodiazepin-2-one (I) with methylamine by means of TiCl4 in refluxing benzene gives 7-chloro-5-(2-fluorophenyl)-2-(methylamino)-3H-1,4-benzodiazepine (II), which is treated with NaNO2 and HOAc to yield the nitroso derivative (III). The condensation of (III) with dimethyl malonate (IV) by means of potassium tert-butoxide in DMF affords 2-[7-chloro-5-(2-fluorophenyl)-2,3-dihydro-1H-1,4-benzodiazepin-2-ylidene]malonic acid dimethyl ester (V), which is monodecarboxylated with KOH in refluxing methanol, providing the corresponding acetate (VI). The reaction of (VI) with NaNO2 and HOAc gives the hydroxyimino derivative (VII), which is reduced with H2 over RaNi in hot methanol to provide the expected amino derivative (VIII). The cyclization of (VIII) with triethyl orthoacetate (IX) and HCl in refluxing ethanol affords 8-chloro-6-(2-fluorophenyl)-4H-imidazo[1,5-a][1,4]benzodiazepine-3-carboxylic acid methyl ester (X), which is hydrolyzed with KOH in refluxing methanol/water to provide the corresponding free acid (XI). Finally, this compound is decarboxylated by heating in refluxing ethyleneglycol to give the target compound along with some 6H-isomer that is separated by chromatography. Alternatively, the decarboxylation of (XI) can also be performed in mineral oil at 230 C to obtain a better yield of the target compound.

1 Bhatia, A.V.; Dhaon, M.K.; Davis, D.A.; Esser, G.L. (Abbott Laboratories Inc.); Process for the preparation of midazolam. WO 0102402 .
2 Walser, A.; Fryer, R.I. (F. Hoffmann-La Roche AG); Process for the preparation of diazepine derivs.. DE 2609486; GB 1549836 .
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) 33355 7-chloro-5-(2-fluorophenyl)-1,3-dihydro-2H-1,4-benzodiazepin-2-one 2886-65-9 C15H10ClFN2O 详情 详情
(II) 33558 N-[7-chloro-5-(2-fluorophenyl)-3H-1,4-benzodiazepin-2-yl]-N-methylamine; 7-chloro-5-(2-fluorophenyl)-N-methyl-3H-1,4-benzodiazepin-2-amine C16H13ClFN3 详情 详情
(III) 33559 N-[7-Chloro-5-(2-fluorophenyl)-3H-1,3-benzodiazepin-2-yl]-N-methyl-N-nitrosoamine C16H12ClFN4O 详情 详情
(IV) 19373 dimethyl malonate;Methyl malonate;Propanedioic acid dimethyl ester 108-59-8 C5H8O4 详情 详情
(V) 44390 dimethyl 2-[7-chloro-5-(2-fluorophenyl)-1,3-dihydro-2H-1,4-benzodiazepin-2-ylidene]malonate C20H16ClFN2O4 详情 详情
(VI) 44391 methyl 2-[7-chloro-5-(2-fluorophenyl)-1,3-dihydro-2H-1,4-benzodiazepin-2-ylidene]acetate C18H14ClFN2O2 详情 详情
(VII) 44392 methyl 2-[7-chloro-5-(2-fluorophenyl)-2,3-dihydro-1H-1,4-benzodiazepin-2-yl]-2-(hydroxyimino)acetate C18H15ClFN3O3 详情 详情
(VIII) 44393 methyl 2-amino-2-[7-chloro-5-(2-fluorophenyl)-2,3-dihydro-1H-1,4-benzodiazepin-2-yl]acetate C18H17ClFN3O2 详情 详情
(IX) 12940 1,1-Diethoxyethyl ethyl ether; 1,1,1-Triethoxyethane; Triethyl orthoacetate 78-39-7 C8H18O3 详情 详情
(X) 44394 methyl 8-chloro-6-(2-fluorophenyl)-1-methyl-4H-imidazo[1,5-a][1,4]benzodiazepine-3-carboxylate C20H15ClFN3O2 详情 详情
(XI) 44395 8-chloro-6-(2-fluorophenyl)-1-methyl-4H-imidazo[1,5-a][1,4]benzodiazepine-3-carboxylic acid C19H13ClFN3O2 详情 详情
Extended Information