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【结 构 式】 
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【分子编号】26873 【品名】5-fluoro-2-methoxyphenylboronic acid 【CA登记号】 |
【 分 子 式 】C7H8BFO3 【 分 子 量 】169.9481232 【元素组成】C 49.47% H 4.74% B 6.36% F 11.18% O 28.24% |
合成路线1
该中间体在本合成路线中的序号：(I)The condensation of phenylboronic acid (I) with methyl 2-bromo-5-nitrobenzoate (II) by means of palladium tetrakis(triphenylphosphine) gives the biphenyl-2-carboxylic ester (III), which is treated with KOH in ethanol/THF to afford the corresponding free acid (IV). The reaction of (IV) with SOCl2 yields the acyl chloridde (V), which is cyclized by means of AlCl3 to provide the dibenzopyranone (VI). The reduction of the nitro group of (VI) with Zn and CaCl2 in refluxing ethanol gives the corresponding amino derivative (VII), which is cyclized with acetone and I2 at 125-35 C yielding the tetracyclic ketone (VIII). The reaction of (VIII) with 3-chlorophenyllithium (IX) in THF affords the tetracyclic hemiketal (X), which is dehydroxylated with boron trifluoride ethearate and triethylsilane in dichloromethane to give the target compound as a racemic mixture (XI). Finally, this racemate is optically resolved by chiral HPLC over a Whelk-O column.
| 【1】 Zhi, L.; Jones, T.K.; Schrader, W.T.; Gottardis, M.M.; Pooley, C.L.F.; West, S.J.; Tegley, C.M.; Wang, M.-W.; Pathirana, C.; Edwards, J.P.; Preparation, resolution, and biological evaluation of 5-aryl-1,2-dihydro-5H-chromeno[3,4-f]quinolines: Potent, orally active, nonsteroidal progesterone receptor agonists. J Med Chem 1998, 41, 15, 2779. |
| 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) | 26873 | 5-fluoro-2-methoxyphenylboronic acid | C7H8BFO3 | 详情 | 详情 | |
| (II) | 26874 | methyl 2-bromo-5-nitrobenzoate | 6942-36-5 | C8H6BrNO4 | 详情 | 详情 |
| (III) | 26875 | methyl 3'-fluoro-6'-methoxy-4-nitro[1,1'-biphenyl]-2-carboxylate | C15H12FNO5 | 详情 | 详情 | |
| (IV) | 26876 | 3'-fluoro-6'-methoxy-4-nitro[1,1'-biphenyl]-2-carboxylic acid | C14H10FNO5 | 详情 | 详情 | |
| (V) | 27428 | 3'-fluoro-6'-methoxy-4-nitro[1,1'-biphenyl]-2-carbonyl chloride | C14H9ClFNO4 | 详情 | 详情 | |
| (VI) | 26877 | 2-fluoro-8-nitro-6H-benzo[c]chromen-6-one | C13H6FNO4 | 详情 | 详情 | |
| (VII) | 26878 | 8-amino-2-fluoro-6H-benzo[c]chromen-6-one | C13H8FNO2 | 详情 | 详情 | |
| (VIII) | 26879 | 9-fluoro-2,2,4-trimethyl-1,2-dihydro-5H-chromeno[3,4-f]quinolin-5-one | C19H16FNO2 | 详情 | 详情 | |
| (IX) | 27429 | (3-chlorophenyl)lithium | C6H4ClLi | 详情 | 详情 | |
| (X) | 27430 | 5-(3-chlorophenyl)-9-fluoro-2,2,4-trimethyl-2,5-dihydro-1H-chromeno[3,4-f]quinolin-5-ol | C25H21ClFNO2 | 详情 | 详情 | |
| (XI) | 27431 | 5-(3-chlorophenyl)-9-fluoro-2,2,4-trimethyl-2,5-dihydro-1H-chromeno[3,4-f]quinoline | C25H21ClFNO | 详情 | 详情 |
合成路线2
该中间体在本合成路线中的序号：(III)Lithiation of 2-bromo-4-fluoroanisole (I) produced the intermediate organolithium reagent (II), which was treated with trimethyl borate to yield, after acid hydrolysis, the arylboronic acid (III). Subsequent Suzuki coupling of (III) with methyl 2-bromo-5-nitrobenzoate (IV) in the presence of palladium catalyst afforded biphenyl (V). The methyl ester group of (V) was hydrolyzed with KOH to give acid (VI). This was converted to the acid chloride with SOCl2, and then cyclized to the benzocoumarin (VII) employing AlCl3. Reduction of the nitro group of (VII) by hydrogenation over Pd/C produced aniline (VIII). The required quinoline derivative (IX) was prepared by heating (VIII) with acetone and iodine in a pressure tube. Then, addition of butyllithium to the lactone function produced hemiacetal (X). This was finally reduced with triethylsilane in the presence of a protic or a Lewis acid to provide the title compound.
| 【1】 Zhi, L.; Tegley, C.M.; Edwards, J.P.; West, S.J.; Marschke, K.B.; Gottardis, M.M.; Mais, D.E.; Jones, T.K.; 5-Alkyl 1,2-dihydrochromeno[3,4-f]quinolines: A novel class of nonsteroidal progesterone receptor modulators. Bioorg Med Chem Lett 1998, 8, 23, 3365. |
| 【2】 Jones, T.K.; Goldman, M.E.; Pooley, C.L.F.; Winn, D.T.; Edwards, J.E.; West, S.J.; Tegley, C.M.; Zhi, L.; Hamann, L.G.; Farmer, L.J.; Davis, R.J. (Ligand Pharmaceuticals, Inc.); Steroid receptor modulator cpds. and methods. EP 0800519; JP 1998510840; US 5688808; US 5688810; US 5693646; US 5693647; US 5696127; US 5696130; US 5696133; WO 9619458 . |
| 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) | 26871 | 2-bromo-4-fluorophenyl methyl ether | 452-08-4 | C7H6BrFO | 详情 | 详情 |
| (II) | 26872 | (5-fluoro-2-methoxyphenyl)lithium | C7H6FLiO | 详情 | 详情 | |
| (III) | 26873 | 5-fluoro-2-methoxyphenylboronic acid | C7H8BFO3 | 详情 | 详情 | |
| (IV) | 26874 | methyl 2-bromo-5-nitrobenzoate | 6942-36-5 | C8H6BrNO4 | 详情 | 详情 |
| (V) | 26875 | methyl 3'-fluoro-6'-methoxy-4-nitro[1,1'-biphenyl]-2-carboxylate | C15H12FNO5 | 详情 | 详情 | |
| (VI) | 26876 | 3'-fluoro-6'-methoxy-4-nitro[1,1'-biphenyl]-2-carboxylic acid | C14H10FNO5 | 详情 | 详情 | |
| (VII) | 26877 | 2-fluoro-8-nitro-6H-benzo[c]chromen-6-one | C13H6FNO4 | 详情 | 详情 | |
| (VIII) | 26878 | 8-amino-2-fluoro-6H-benzo[c]chromen-6-one | C13H8FNO2 | 详情 | 详情 | |
| (IX) | 26879 | 9-fluoro-2,2,4-trimethyl-1,2-dihydro-5H-chromeno[3,4-f]quinolin-5-one | C19H16FNO2 | 详情 | 详情 | |
| (X) | 26880 | 5-butyl-9-fluoro-2,2,4-trimethyl-2,5-dihydro-1H-chromeno[3,4-f]quinolin-5-ol | C23H26FNO2 | 详情 | 详情 |