Diethyl Ether → Panobinostat Carboxylic Acid Methyl Ester Hydrochloride

HRID 1267298Notes

Reaction equation

HRID 1267298 reaction equation
[CH3:1][O:2][C:3](=[O:26])/[CH:4]=[CH:5]/[C:6]1[CH:11]=[CH:10][C:9]([CH2:12][NH:13][CH2:14][CH2:15][C:16]2[C:24]3[C:19](=[CH:20][CH:21]=[CH:22][CH:23]=3)[NH:18][C:17]=2[CH3:25])=[CH:8][CH:7]=1.[ClH:27].O1CCOCC1.CCOCC>CO>[ClH:27].[CH3:1][O:2][C:3](=[O:26])/[CH:4]=[CH:5]/[C:6]1[CH:11]=[CH:10][C:9]([CH2:12][NH:13][CH2:14][CH2:15][C:16]2[C:24]3[C:19](=[CH:20][CH:21]=[CH:22][CH:23]=3)[NH:18][C:17]=2[CH3:25])=[CH:8][CH:7]=1

Participants

5

Reactant 3

HCID 3283Diethyl EtherHCID 204431481,4-Dioxane hydrochlorideHCID 23652685(E)-Methyl 3-(4-(((2-(2-methyl-1H-indol-3-yl)ethyl)amino)methyl)phenyl)acrylate

Product 1

HCID 23652684Panobinostat Carboxylic Acid Methyl Ester Hydrochloride

Reagents, catalysts & solvents 1

HCID 887MethanolSolvent

Procedure

A suspension of LiAlH4 (17 g, 445 mmol) in dry THF(1000 mL) is cooled to 0° C. and 2-methylindole-3-glyoxylamide (30 g, 148 mmol) is added in portions over 30 min. The mixture is stirred at room temperature for 30 min. and then maintained at reflux for 3 h. The reaction is cooled to 0° C. and treated with H2O (17 ml), 15% NaOH (aq., 17 ml) and H2O (51 ml). The mixture is treated with MgSO4, filtered and the filtrate evaporated to give 2-methyltryptamine which is dissolved in MeOH. Methyl 4-formylcinnamate (16.9 g, 88.8 mmol) is added to the solution, followed by NaBH3CN (8.4 g) and AcOH (1 equiv.). After 1 h the reaction is diluted with NaHCO3 (aq.) and extracted with EtOAc. The organic extracts are dried (MgSO4), filtered and evaporated. The residue is purified by chromatography to give 3-(4-{[2-(2-methyl-1H-indol-3-yl)-ethylamino]-methyl}-phenyl)-(2E)-2-propenoic acid methyl ester. The ester is dissolved in MeOH, 1.0 M HCl/dioxane (1-1.5 eqiv.) is added followed by Et2O. The resulting precipitate is filtered and the solid washed with Et2O and dried thoroughly to give 3-(4-{[2-(2-methyl-1H-indol-3-yl)-ethylamino]-methyl}-phenyl)-(2 E)-2-propenoic acid methyl ester hydrochloride. 1.0 M NaOH (aq., 85 mL) is added to an ice cold solution of the methyl ester hydrochloride (14.9 g, 38.6 mmol) and HONH2 (50% aq. solution, 24.0 mL, ca. 391.2 mmol). After 6 h, the ice cold solution is diluted with H2O and NH4Cl (aq., 0.86 M, 100 mL). The resulting precipitate is filtered, washed with H2O and dried to afford N-hydroxy-3-[4-[[[2-(2-methyl-1H-indol-3-yl)-ethyl]-amino]methyl]phenyl]-2E-2-propenamide (m/z 350 [MH+]).

Workup

  1. filtrationThe resulting precipitate is filtered
  2. washthe solid washed with Et2O
  3. customdried thoroughly

Sources & evidence

ORD record
ord-a1711c9b953c491d8a2ee306b40c85a3
Source dataset
uspto-grants-2003_04
Patent number
US06552065B2

Reaction notes

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