4-Methylmorpholine → tert-butyl (3S,5R)-3-[{[6-fluoro-1-(4-methoxybutyl)-1H-benzimidazol-2-yl]carbonyl}(2-methylpropyl)amino]-5-(hydroxymethyl)piperidine-1-carboxylate

HRID 1184100Notes

Reaction equation

HRID 1184100 reaction equation
[C:1]([O:5][C:6]([N:8]1[CH2:13][C@@H:12]([N:14]([C:19]([C:21]2[N:25]([CH2:26][CH2:27][CH2:28][CH2:29][O:30][CH3:31])[C:24]3[CH:32]=[C:33]([F:36])[CH:34]=[CH:35][C:23]=3[N:22]=2)=[O:20])[CH2:15][CH:16]([CH3:18])[CH3:17])[CH2:11][C@@H:10]([C:37](O)=[O:38])[CH2:9]1)=[O:7])([CH3:4])([CH3:3])[CH3:2].CN1CCOCC1.C(Cl)(=O)OCC.[BH4-].[Na+]>C1COCC1.C(=O)(O)[O-].[Na+].CO>[F:36][C:33]1[CH:34]=[CH:35][C:23]2[N:22]=[C:21]([C:19]([N:14]([CH2:15][CH:16]([CH3:18])[CH3:17])[C@H:12]3[CH2:11][C@@H:10]([CH2:37][OH:38])[CH2:9][N:8]([C:6]([O:5][C:1]([CH3:3])([CH3:2])[CH3:4])=[O:7])[CH2:13]3)=[O:20])[N:25]([CH2:26][CH2:27][CH2:28][CH2:29][O:30][CH3:31])[C:24]=2[CH:32]=1

Participants

8

Reactant 4

HCID 79724-MethylmorpholineHCID 10928Ethyl chloroformateHCID 4311764Sodium borohydrideHCID 58355153(3R,5S)-(tert-butoxycarbonyl)-5-[{[6-fluoro-1-(4-methoxybutyl)-1H-benzimidazol-2-yl]carbonyl}(2-methylpropyl)amino]piperidine-3-carboxylic acid

Product 1

HCID 58355683tert-butyl (3S,5R)-3-[{[6-fluoro-1-(4-methoxybutyl)-1H-benzimidazol-2-yl]carbonyl}(2-methylpropyl)amino]-5-(hydroxymethyl)piperidine-1-carboxylateYield 68.2%

Reagents, catalysts & solvents 3

HCID 887MethanolSolventHCID 8028TetrahydrofuranSolventHCID 516892Sodium BicarbonateSolvent

Procedure

To a solution of (3R,5S)-1-(tert-butoxycarbonyl)-5-[{[6-fluoro-1-(4-methoxybutyl)-1H-benzimidazol-2-yl]carbonyl}(2-methylpropyl)amino]piperidine-3-carboxylic acid (274 mg) and 4-methylmorpholine (66 μl) in THF (5 ml) was added dropwise ethyl chlorocarbonate (57 μl) at 0° C., and the mixture was stirred at the same temperature for 1 hr. Sodium borohydride (57 mg) and methanol (1 ml) were added to the reaction mixture, and the mixture was stirred at 0° C. for 1 hr. The reaction mixture was diluted with aqueous sodium bicarbonate, and the mixture was extracted with ethyl acetate. The extract was washed with saturated brine, and dried over anhydrous sodium sulfate. The solvent was evaporated under reduced pressure. The residue was subjected to basic silica gel column chromatography, and a fraction eluted with ethyl acetate was concentrated under reduced pressure to give the object product (182 mg).

Workup

  1. stirringthe mixture was stirred at 0° C. for 1 hr
  2. extractionthe mixture was extracted with ethyl acetate
  3. washThe extract was washed with saturated brine
  4. dry with materialdried over anhydrous sodium sulfate
  5. customThe solvent was evaporated under reduced pressure
  6. washa fraction eluted with ethyl acetate
  7. concentrationwas concentrated under reduced pressure

Sources & evidence

ORD record
ord-3745ca33f27049d7b913f07afcbc3d09
Source dataset
uspto-grants-2014_03
Patent number
US08664380B2

Reaction notes

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