Hydrogen chloride-ethyl acetate → methyl(3R,5S)-5-[{[1-(4-methoxybutyl)-1H-indol-2-yl]carbonyl}(2-methylpropyl)amino]piperidine-3-carboxylate

HRID 1184072Notes

Reaction equation

HRID 1184072 reaction equation
[CH3:1][O:2][CH2:3][CH2:4][CH2:5][CH2:6][N:7]1[C:15]2[C:10](=[CH:11][CH:12]=[CH:13][CH:14]=2)[CH:9]=[C:8]1[C:16]([N:18]([CH2:36][CH:37]([CH3:39])[CH3:38])[C@@H:19]1[CH2:24][N:23](C(OC(C)(C)C)=O)[CH2:22][C@H:21]([C:32]([O:34][CH3:35])=[O:33])[CH2:20]1)=[O:17].C(OCC)(=O)C.Cl>CO>[CH3:1][O:2][CH2:3][CH2:4][CH2:5][CH2:6][N:7]1[C:15]2[C:10](=[CH:11][CH:12]=[CH:13][CH:14]=2)[CH:9]=[C:8]1[C:16]([N:18]([CH2:36][CH:37]([CH3:39])[CH3:38])[C@@H:19]1[CH2:24][NH:23][CH2:22][C@H:21]([C:32]([O:34][CH3:35])=[O:33])[CH2:20]1)=[O:17]

Participants

4

Reactant 2

HCID 21866389Hydrogen chloride-ethyl acetateHCID 86642208HCID 86642208, compound

Product 1

HCID 58355112methyl(3R,5S)-5-[{[1-(4-methoxybutyl)-1H-indol-2-yl]carbonyl}(2-methylpropyl)amino]piperidine-3-carboxylateYield 39.8%

Reagents, catalysts & solvents 1

HCID 887MethanolSolvent

Procedure

1-(4-Methoxybutyl)-1H-indole-2-carboxylic acid (247 mg), 1-tert-butyl 3-methyl (3R,5S)-5-[(2-methylpropyl)amino]piperidine-1,3-dicarboxylate (314 mg) and diisopropylethylamine (862 μl) were dissolved in methylene chloride (5 ml), chloro-N,N,N′,N′-tetramethylformamidinium hexafluorophosphate (337 mg) was added, and the mixture was stirred at room temperature for 15 hr. The reaction mixture was subjected to silica gel column chromatography, and a fraction eluted with ethyl acetate-hexane (3:7) was concentrated under reduced pressure to give 1-tert-butyl 3-methyl (3R,5S)-5-[{[1-(4-methoxybutyl)-1H-indol-2-yl]carbonyl}(2-methylpropyl)amino]piperidine-1,3-dicarboxylate (40 mg) as an oil. The obtained 1-tert-butyl 3-methyl (3R,5S)-5-[{[1-(4-methoxybutyl)-1H-indol-2-yl]carbonyl}(2-methylpropyl)amino]piperidine-1,3-dicarboxylate (40 mg) was dissolved in methanol (2 ml), 4M hydrogen chloride-ethyl acetate (2 ml) was added, and the mixture was stirred at room temperature for 15 hr. The reaction mixture was concentrated, and the residue was purified by reversed-phase preparative HPLC, and the object fraction was concentrated under reduced pressure. An aqueous sodium bicarbonate solution was added to the residue, and the mixture was extracted with ethyl acetate. The extract was washed with saturated brine, dried over anhydrous magnesium sulfate, and concentrated to give the object product (13 mg).

Workup

  1. concentrationThe reaction mixture was concentrated
  2. customthe residue was purified by reversed-phase preparative HPLC
  3. concentrationthe object fraction was concentrated under reduced pressure
  4. additionAn aqueous sodium bicarbonate solution was added to the residue
  5. extractionthe mixture was extracted with ethyl acetate
  6. washThe extract was washed with saturated brine
  7. dry with materialdried over anhydrous magnesium sulfate
  8. concentrationconcentrated

Sources & evidence

ORD record
ord-89d2f0b5fe094692b54148782c8e95a3
Source dataset
uspto-grants-2014_03
Patent number
US08664380B2

Reaction notes

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