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【结 构 式】 
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【分子编号】26628 【品名】1-bromo-4-nitrobenzene 【CA登记号】99-99-0 |
【 分 子 式 】C6H4BrNO2 【 分 子 量 】202.0073 【元素组成】C 35.67% H 2% Br 39.56% N 6.93% O 15.84% |
合成路线1
该中间体在本合成路线中的序号：(I)The intermediate 4-[4-(4-aminophenyl)piperazin-1-yl]phenol (VIII) has been obtained by several related ways: 1.- The condensation of 4-bromonitrobenzene (I) with piperazine (II) gives 1-(4-nitrophenyl)piperazine (III), which is condensed with 4-bromoanisole (IV) by means of Pdo to yield 1-(4-methoxyphenyl)-4-(4-nitrophenyl)piperazine (V). Alternatively, (V) can also be obtained by condensation of (III) with 4-methoxyphenylboronic acid (VI) by means of Cu(OAc)2 in DMSO. The demethylation of (V) with HBr yields 4-[4-(4-nitrophenyl)piperazin-1-yl]phenol (VII), which is finally reduced with H2 over Pd/C to afford the target 4-[4-(4-aminophenyl)piperazin-1-yl]phenol (VIII) intermediate (see Synthline, scheme no. 22656202a, intermediate (XIV)). 2.- The condensation of piperazine (II) with 4-bromoanisole (IV) by means of Pdo gives 1-(4-methoxyphenyl)piperazine (IX), which is condensed with 4-bromonitrobenzene (I) by means of K2CO3 and tetrabutylammonium iodide (TBAI) in hot DMSO to yield intermediate 1-(4-methoxyphenyl)-4-(4-nitrophenyl)piperazine (V), already reported. 3.- The condensation of piperazine (II) with 4-(benzyloxy)phenyl bromide (X) by means of Pdo gives 1-(4-benzyloxyphenyl)piperazine (XI), which is condensed with 4-bromonitrobenzene (I) by means of K2CO3 and TBAI in hot DMSO to yield 1-(4-benzyloxyphenyl)-4-(4-nitrophenyl)piperazine (XII). The nitro group of (XII) is reduced by means of H2 (50 psi) over Pd/C in wet THF at 50? C to afford 4-[4-(4-benzyloxyphenyl)piperazin-1-yl]aniline (XIII), which is finally debenzylated with H2 (80 psi) over Pd/C in wet THF at 70? C or other drastic conditions to afford the target 4-[4-(4-aminophenyl)piperazin-1-yl]phenol (VIII) intermediate (see Synthline, scheme no. 22656202a, intermediate (XIV)). Alternatively, 1-(4-benzyloxyphenyl)-4-(4-nitrophenyl)piperazine (XII) can also be reduced directly to the target intermediate (VIII) with H2 over Pd/C under a variety of drastic conditions.
| 【1】 Hepperle, M.; Eckert, J.; Gala, D.; Shen, L.; Evans, C.A.; Goodman, A.; Mono N-arylation of piperazine(III): Metal-catalyzed N-arylation and its application to the novel preparations of the antifungal posaconazole and its advanced intermediate. Tetrahedron Lett 2002, 43, 18, 3359. |
| 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) | 26628 | 1-bromo-4-nitrobenzene | 99-99-0 | C6H4BrNO2 | 详情 | 详情 |
| (II) | 10355 | Diethylenediamine; Piperazine | 110-85-0 | C4H10N2 | 详情 | 详情 |
| (III) | 20299 | 1-(4-nitrophenyl)piperazine | 6269-89-2 | C10H13N3O2 | 详情 | 详情 |
| (IV) | 63436 | 1-bromo-4-methoxybenzene; 4-bromophenyl methyl ether | C7H7BrO | 详情 | 详情 | |
| (V) | 16314 | methyl 4-[4-(4-nitrophenyl)piperazino]phenyl ether; 1-(4-methoxyphenyl)-4-(4-nitrophenyl)piperazine | C17H19N3O3 | 详情 | 详情 | |
| (VI) | 39246 | 4-methoxyphenylboronic acid | 5720-07-0 | C7H9BO3 | 详情 | 详情 |
| (VII) | 16345 | 4-[4-(4-nitrophenyl)piperazino]phenol | C16H17N3O3 | 详情 | 详情 | |
| (VIII) | 17110 | 4-[4-(4-aminophenyl)piperazino]phenol; 1-(4-Aminophenyl)-4-(4-hydroxyphenyl)piperazine; 1-(4-Hydroxyphenyl)-4-(4-aminophenyl)piperazine | 74853-08-0 | C16H19N3O | 详情 | 详情 |
| (IX) | 16312 | 1-(4-Methoxyphenyl)piperazine; Methyl 4-piperazinophenyl ether | 38212-30-5 | C11H16N2O | 详情 | 详情 |
| (X) | 43156 | 1-(benzyloxy)-4-bromobenzene; benzyl 4-bromophenyl ether | 6793-92-6 | C13H11BrO | 详情 | 详情 |
| (XI) | 64373 | 1-[4-(benzyloxy)phenyl]piperazine; benzyl 4-(1-piperazinyl)phenyl ether | C17H20N2O | 详情 | 详情 | |
| (XII) | 64372 | benzyl 4-[4-(4-nitrophenyl)-1-piperazinyl]phenyl ether; 1-[4-(benzyloxy)phenyl]-4-(4-nitrophenyl)piperazine | C23H23N3O3 | 详情 | 详情 | |
| (XIII) | 64371 | 4-{4-[4-(benzyloxy)phenyl]-1-piperazinyl}aniline; 4-{4-[4-(benzyloxy)phenyl]-1-piperazinyl}phenylamine | C23H25N3O | 详情 | 详情 |
合成路线2
该中间体在本合成路线中的序号：(III)The reaction of N-tert-butylbenzenesulfonamide (I) with triisopropyl borate by means of BuLi in THF gives the boronic acid (II), which is condensed with 4-bromonitrobenzene (III) by means of palladium tetrakis(triphenylphosphine) to yield the N-tert-butyl-4'-nitrobiphenyl-2-sulfonamide (IV). The reduction of (IV) with H2 over Pd/C in methanol affords the biphenylamine (V), which is acylated with 3-(3-cyanophenyl)-5-(methoxycarbonylmethyl)-4,5-dihydroisoxazole-5-carboxylic acid (VI), by means of SOCl2 in acetonitrile affording the corresponding amide (VII). The reaction of (VII) with trifluoroacetic acid eliminates the tert-butyl protecting group providing intermediate (VIII). Finally, the cyano group of (VIII) is converted into amidino by reaction with HCl in chloroform/methanol and reaction of the intermediate imidate with ammonium acetate. Alternatively, biphenylamine (V) can also be obtained as follows: The reaction of 4-bromoaniline (IX) with tert-butoxycarbonyl anhydride in THF gives the corresponding carbamate (X), which is condensed with the boronic acid (II) by means of palladium tetrakis triphenylphosphine and deprotected with trifluoroacetic acid to afford the target intermediate (V).
| 【1】 Quan, M.L.; Wityak, J.; Galemmo, R.A. Jr.; Stouten, P.F.W.; Pruitt, J.R. (DuPont Pharmaceuticals Co.); Isoxazoline, isothiazoline and pyrazoline factor Xa inhibitors. EP 0874629; US 5939418; WO 9723212 . |
| 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) | 26626 | N-(tert-butyl)benzenesulfonamide | C10H15NO2S | 详情 | 详情 | |
| (II) | 26627 | 2-[(tert-butylamino)sulfonyl]phenylboronic acid | C10H16BNO4S | 详情 | 详情 | |
| (III) | 26628 | 1-bromo-4-nitrobenzene | 99-99-0 | C6H4BrNO2 | 详情 | 详情 |
| (IV) | 26629 | N-(tert-butyl)-4'-nitro[1,1'-biphenyl]-2-sulfonamide | C16H18N2O4S | 详情 | 详情 | |
| (V) | 23363 | 4'-amino-N-(tert-butyl)[1,1'-biphenyl]-2-sulfonamide | C16H20N2O2S | 详情 | 详情 | |
| (VI) | 26630 | 3-(3-cyanophenyl)-5-(2-methoxy-2-oxoethyl)-4,5-dihydro-5-isoxazolecarboxylic acid | C14H12N2O5 | 详情 | 详情 | |
| (VII) | 26631 | methyl 2-[5-[([2'-[(tert-butylamino)sulfonyl][1,1'-biphenyl]-4-yl]amino)carbonyl]-3-(3-cyanophenyl)-4,5-dihydro-5-isoxazolyl]acetate | C30H30N4O6S | 详情 | 详情 | |
| (VIII) | 26632 | methyl 2-[5-([[2'-(aminosulfonyl)[1,1'-biphenyl]-4-yl]amino]carbonyl)-3-(3-cyanophenyl)-4,5-dihydro-5-isoxazolyl]acetate | C26H22N4O6S | 详情 | 详情 | |
| (IX) | 22531 | 4-Bromoaniline; 4-Bromophenylamine | 106-40-1 | C6H6BrN | 详情 | 详情 |
| (X) | 26633 | tert-butyl 4-bromophenylcarbamate | C11H14BrNO2 | 详情 | 详情 |
合成路线3
该中间体在本合成路线中的序号：(XII)Suzuki coupling of 3-piperidinylboronic acid (X) with 1-iodo-4-nitrobenzene (XI) by means of Pd(PPh3)4 and Na2CO3 in THF , or with 1-bromo-4-nitrobenzene (XII) in the presence of PdCl2(dppf) and Na2CO3 in THF at 60 °C , gives 3-(4-nitrophenyl)piperidine (XIII), which is reduced with H2 over PtO2 in the presence of HCl in MeOH to yield 4-(3-piperidinyl)aniline (XIV) . Resolution of 4-(3-piperidinyl)aniline (XIV) with L-tartaric acid in refluxing EtOH affords 4-[3(S)-piperidinyl]aniline L-tartrate (XV), which is then N-protected by means of Boc2O in CH2Cl2, followed by basification with NH3 in MeOH to provide 4-[N-Boc-3(S)-piperidyl]aniline (XVI) . Condensation of aniline derivative (XVI) with the benzaldehyde derivative (IV) in refluxing EtOH or in MTBE at 50 °C leads to azomethine (XVII) , which then undergoes initial substitution of the nitro group and subsequent cyclization by means of NaN3 in DMF at 90 °C to result in the indazole derivative (XVIII) . Alternatively, cyclization of (XVII) with NaN3 in the presence of 2,6-lutidine in DMF at 110 °C, followed by ester hydrolysis with NaOH, affords indazole derivative (XVIII) . Amidation of methyl ester (XVIII) with NH3 in MeOH or sequential treatment with Boc2O in the presence of pyridine and reaction with NH4HCO3 gives the corresponding carboxamide (XIX) , which is finally N-deprotected with HCl in AcOEt .
Alternatively, intermediate (XVI) can be prepared by N-protection of 4-(3-piperidinyl)aniline (XIV) with Boc2O in CH2Cl2 to give tert-butyl 3-(4-aminophenyl)piperidine-1-carboxylate (V), which is finally resolved into enantiomer using chiral HPLC .
| 【1】 Jones, P., Altamura, S., Boueres, J. et al. Discovery of 2-{4-[(3S)-piperidin-3-yl]phenyl}-2H-indazole-7-carboxamide (MK-4827): A novel oral poly(ADP-ribose)polymerase (PARP) inhibitor efficacious in BRCA-1 and -2 mutant tumors. J Med Chem 2009, 52(22): 7170-85. |
| 【2】 Wallace, D.J., Baxter, C.A., Brands, K.J.M. et al. Development of a fit-forpurpose large-scale synthesis of an oral PARP inhibitor. Org Process Res Dev 2011, 15(4): 831-40. |
| 中间体序号 | 中间体编号 | 品名 | CAS号 | 分子式 | 供应商 | 用于合成 |
|---|---|---|---|---|---|---|
| (IV) | 68112 | methyl 3-formyl-2-nitrobenzoate | C9H7NO5 | 详情 | 详情 | |
| (V) | 68113 | tert-butyl 3-(4-aminophenyl)piperidine-1-carboxylate | C16H24N2O2 | 详情 | 详情 | |
| (X) | 68118 | (1,3-azaborinan-3-yl)methanediol | C5H12BNO2 | 详情 | 详情 | |
| (XI) | 21845 | 1-iodo-4-nitrobenzene | 636-98-6 | C6H4INO2 | 详情 | 详情 |
| (XII) | 26628 | 1-bromo-4-nitrobenzene | 99-99-0 | C6H4BrNO2 | 详情 | 详情 |
| (XIII) | 68119 | 3-(4-nitrophenyl)piperidine | C11H14N2O2 | 详情 | 详情 | |
| (XIV) | 68120 | 4-(3-piperidinyl)aniline | C11H16N2 | 详情 | 详情 | |
| (XV) | 68121 | 4-[3(S)-piperidinyl]aniline L-tartrate | C11H16N2.C4H6O6 | 详情 | 详情 | |
| (XVI) | 68122 | tert-butyl 3(S)-(4-aminophenyl)piperidine-1-carboxylate | C16H24N2O2 | 详情 | 详情 | |
| (XVII) | 68125 | (E)-tert-butyl 3(S)-(4-((3-(methoxycarbonyl)-2-nitrobenzylidene)amino)phenyl)piperidine-1-carboxylate | C25H29N3O6 | 详情 | 详情 | |
| (XVIII) | 68123 | (S)-methyl 2-(4-(1-(tert-butoxycarbonyl)piperidin-3-yl)phenyl)-2H-indazole-7-carboxylate | C25H29N3O4 | 详情 | 详情 | |
| (XIX) | 68124 | tert-butyl 3(S)-(4-(7-carbamoyl-2H-indazol-2-yl)phenyl)piperidine-1-carboxylate | C24H28N4O3 | 详情 | 详情 |