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【结 构 式】 
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【分子编号】46937 【品名】4-fluoro-3-nitrobenzoic acid 【CA登记号】453-71-4 |
【 分 子 式 】C7H4FNO4 【 分 子 量 】185.1115032 【元素组成】C 45.42% H 2.18% F 10.26% N 7.57% O 34.57% |
合成路线1
该中间体在本合成路线中的序号：(I)Esterification of 4-fluoro-3-nitrobenzoic acid (I) with MeOH in the presence of SOCl2 provided the methyl ester (II). Subsequent displacement of the fluoro group with the imidazolyl piperidine (III) gave adduct (IV), which was further protected as the N-trityl derivative (V) using triphenylmethyl chloride and N-methylmorpholine. Catalytic hydrogenation of the nitro group of (V) over Raney-Ni produced aniline (VI), which was acylated with cyclopropanecarbonyl chloride (VII) to furnish amide (VIII). After basic hydrolysis of the methyl ester group of (VIII), the resultant carboxylic acid (IX) was coupled with N,N-dimethyl ethanediamine (X) using PyBOP to yield amide (XI). Finally, acidic treatment of (XI) with HOAc removed the N-trityl protecting group.
| 【1】 Hoornaert, C.; Rouannet, V.; Dellac, G.; Daumas, M.; Adler, M.-A.; Cremer, G. (Sanofi-Synthelabo); 4-[(1H-Imidazol-4-yl)piperidin-1-yl]anilide derivs., their preparation and application in therapy. EP 0991639; WO 9900379 . |
| 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) | 46937 | 4-fluoro-3-nitrobenzoic acid | 453-71-4 | C7H4FNO4 | 详情 | 详情 |
| (II) | 46938 | methyl 4-fluoro-3-nitrobenzoate | C8H6FNO4 | 详情 | 详情 | |
| (III) | 46939 | 4-(5-methyl-1H-imidazol-4-yl)piperidine | C9H15N3 | 详情 | 详情 | |
| (IV) | 46940 | methyl 4-[4-(5-methyl-1H-imidazol-4-yl)-1-piperidinyl]-3-nitrobenzoate | C17H20N4O4 | 详情 | 详情 | |
| (V) | 46945 | methyl 4-[4-(5-methyl-1-trityl-1H-imidazol-4-yl)-1-piperidinyl]-3-nitrobenzoate | C36H34N4O4 | 详情 | 详情 | |
| (VI) | 46941 | methyl 3-amino-4-[4-(5-methyl-1-trityl-1H-imidazol-4-yl)-1-piperidinyl]benzoate | C36H36N4O2 | 详情 | 详情 | |
| (VII) | 14061 | Cyclopropanecarbonyl chloride; Cyclopropanecarboxylic acid chloride | 4023-34-1 | C4H5ClO | 详情 | 详情 |
| (VIII) | 46942 | methyl 3-[(cyclopropylcarbonyl)amino]-4-[4-(5-methyl-1-trityl-1H-imidazol-4-yl)-1-piperidinyl]benzoate | C40H40N4O3 | 详情 | 详情 | |
| (IX) | 46943 | 3-[(cyclopropylcarbonyl)amino]-4-[4-(5-methyl-1-trityl-1H-imidazol-4-yl)-1-piperidinyl]benzoic acid | C39H38N4O3 | 详情 | 详情 | |
| (X) | 14881 | N-(2-aminoethyl)-N,N-dimethylamine; N(1),N(1)-dimethyl-1,2-ethanediamine; 2-Dimethylaminoethylamine | 108-00-9 | C4H12N2 | 详情 | 详情 |
| (XI) | 46944 | 3-[(cyclopropylcarbonyl)amino]-N-[2-(dimethylamino)ethyl]-4-[4-(5-methyl-1-trityl-1H-imidazol-4-yl)-1-piperidinyl]benzamide | C43H48N6O2 | 详情 | 详情 |
合成路线2
该中间体在本合成路线中的序号：(I)The condensation of 4-fluoro-3-nitrobenzoic acid (I) with 1-methylpiperazine (II) by means of oxalyl chloride in dichloromethane gives the expected acyl derivative (III), which is reduced with BH3/THF to yield the benzyl piperazine (IV). The condensation of (IV) with 2(R)-hydroxy-2-phenylethylamine (V) by means of DIEA in NMP affords the secondary amine (VI), which is reduced with H2 over Pd/C in ethanol, providing the phenylenediamine (VII). Finally, this compound is cyclized with 4-methoxybenzoyl isothiocyanate (VIII) by means of EDC in DMF to furnish the target benzimidazole.
| 【1】 Heyer, D.; et al.; 2-Aminobenzimidazoles: A class of orally bioavailable and brain permeable neuropeptide YY5 antagonists. 222nd ACS Natl Meet (Aug 26 2001, Chicago) 2001, Abst MEDI 284. |
| 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) | 46937 | 4-fluoro-3-nitrobenzoic acid | 453-71-4 | C7H4FNO4 | 详情 | 详情 |
| (II) | 10061 | 1-Methylpiperazine; 1-Methyl piperazine; N-Methylpiperazine | 109-01-3 | C5H12N2 | 详情 | 详情 |
| (III) | 54041 | (4-fluoro-3-nitrophenyl)(4-methyl-1-piperazinyl)methanone | C12H14FN3O3 | 详情 | 详情 | |
| (IV) | 54042 | 1-(4-fluoro-3-nitrobenzyl)-4-methylpiperazine | C12H16FN3O2 | 详情 | 详情 | |
| (V) | 10173 | (1R)-2-Amino-1-phenyl-1-ethanol | 2549-14-6 | C8H11NO | 详情 | 详情 |
| (VI) | 54043 | (1R)-2-{4-[(4-methyl-1-piperazinyl)methyl]-2-nitroanilino}-1-phenyl-1-ethanol | C20H26N4O3 | 详情 | 详情 | |
| (VII) | 54044 | (1R)-2-{2-amino-4-[(4-methyl-1-piperazinyl)methyl]anilino}-1-phenyl-1-ethanol | C20H28N4O | 详情 | 详情 | |
| (VIII) | 54045 | 4-Methoxybenzoyl isothiocyanate | 16778-84-0 | C9H7NO2S | 详情 | 详情 |
合成路线3
该中间体在本合成路线中的序号：(I)Alternatively, the reduction of 4-fluoro-3-nitrobenzoic acid (I) with BH3/THF gives the benzyl alcohol (IX), which is treated with PBr3 in ethyl ether to yield the benzyl bromide (X). Finally, this compound is condensed with 1-methylpiperazine (II) by means of DIEA in THF to afford the already reported benzyl piperazine intermediate (IV).
| 【1】 Heyer, D.; et al.; 2-Aminobenzimidazoles: A class of orally bioavailable and brain permeable neuropeptide YY5 antagonists. 222nd ACS Natl Meet (Aug 26 2001, Chicago) 2001, Abst MEDI 284. |
| 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) | 46937 | 4-fluoro-3-nitrobenzoic acid | 453-71-4 | C7H4FNO4 | 详情 | 详情 |
| (II) | 10061 | 1-Methylpiperazine; 1-Methyl piperazine; N-Methylpiperazine | 109-01-3 | C5H12N2 | 详情 | 详情 |
| (IV) | 54042 | 1-(4-fluoro-3-nitrobenzyl)-4-methylpiperazine | C12H16FN3O2 | 详情 | 详情 | |
| (IX) | 54046 | (4-fluoro-3-nitrophenyl)methanol | C7H6FNO3 | 详情 | 详情 | |
| (X) | 47038 | 4-(bromomethyl)-1-fluoro-2-nitrobenzene | C7H5BrFNO2 | 详情 | 详情 |
合成路线4
该中间体在本合成路线中的序号：(I)The reduction of 4-fluoro-3-nitrobenzoic acid (I) with BH3/THF gives the benzyl alcohol (IX), which is condensed with 2(R)-hydroxy-2-phenylethylamine (V) by means of DIEA in NMP to yield nitro compound (XI). Derivative (XI) is then converted into secondary amine (XII) by reduction either with H2 over Pd/C in EtOH or with Na2S·9H2O in dioxane/H2O or by treatment with Na2S2O4 in dioxane/NH4OH. Cyclization of (XI) with 4-methoxybenzoyl isothiocyanate (VIII) by means of EDC in DMF affords the benzimidazole (XIII), which is oxidized at the carbinol group by means of MnO2 in THF to provide the corresponding carbaldehyde (XIV). Finally, this compound is reductocondensed with 1-methylpiperazine (II) by means of NaBH(OAc)3 to furnish the target benzimidazole.
| 【1】 Heyer, D.; et al.; 2-Aminobenzimidazoles: A class of orally bioavailable and brain permeable neuropeptide YY5 antagonists. 222nd ACS Natl Meet (Aug 26 2001, Chicago) 2001, Abst MEDI 284. |
| 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) | 46937 | 4-fluoro-3-nitrobenzoic acid | 453-71-4 | C7H4FNO4 | 详情 | 详情 |
| (II) | 10061 | 1-Methylpiperazine; 1-Methyl piperazine; N-Methylpiperazine | 109-01-3 | C5H12N2 | 详情 | 详情 |
| (V) | 10173 | (1R)-2-Amino-1-phenyl-1-ethanol | 2549-14-6 | C8H11NO | 详情 | 详情 |
| (VIII) | 54045 | 4-Methoxybenzoyl isothiocyanate | 16778-84-0 | C9H7NO2S | 详情 | 详情 |
| (IX) | 54046 | (4-fluoro-3-nitrophenyl)methanol | C7H6FNO3 | 详情 | 详情 | |
| (XI) | 54047 | (1R)-2-[4-(hydroxymethyl)-2-nitroanilino]-1-phenyl-1-ethanol | C15H16N2O4 | 详情 | 详情 | |
| (XII) | 54048 | (1R)-2-[2-amino-4-(hydroxymethyl)anilino]-1-phenyl-1-ethanol | C15H18N2O2 | 详情 | 详情 | |
| (XIII) | 54049 | N-{5-(hydroxymethyl)-1-[(2R)-2-hydroxy-2-phenylethyl]-1H-benzimidazol-2-yl}-4-methoxybenzamide | C24H23N3O4 | 详情 | 详情 | |
| (XIV) | 54050 | N-{5-formyl-1-[(2R)-2-hydroxy-2-phenylethyl]-1H-benzimidazol-2-yl}-4-methoxybenzamide | C24H21N3O4 | 详情 | 详情 |