Triphenylphosphine → tert-butyl (3S,5R)-3-[{[1-(4-methoxybutyl)-1H-benzimidazol-2-yl]carbonyl}(2-methylpropyl)amino]-5-(1H-1,2,4-triazol-1-ylmethyl)piperidine-1-carboxylate

HRID 2168974Notes

Reaction equation

HRID 2168974 reaction equation
O[CH2:2][C@@H:3]1[CH2:8][C@H:7]([N:9]([C:14]([C:16]2[N:20]([CH2:21][CH2:22][CH2:23][CH2:24][O:25][CH3:26])[C:19]3[CH:27]=[CH:28][CH:29]=[CH:30][C:18]=3[N:17]=2)=[O:15])[CH2:10][CH:11]([CH3:13])[CH3:12])[CH2:6][N:5]([C:31]([O:33][C:34]([CH3:37])([CH3:36])[CH3:35])=[O:32])[CH2:4]1.[NH:38]1[CH:42]=[N:41][N:40]=[CH:39]1.C1(P(C2C=CC=CC=2)C2C=CC=CC=2)C=CC=CC=1.N(C(OC(C)C)=O)=NC(OC(C)C)=O>C1COCC1>[CH3:26][O:25][CH2:24][CH2:23][CH2:22][CH2:21][N:20]1[C:19]2[CH:27]=[CH:28][CH:29]=[CH:30][C:18]=2[N:17]=[C:16]1[C:14]([N:9]([CH2:10][CH:11]([CH3:13])[CH3:12])[C@H:7]1[CH2:8][C@@H:3]([CH2:2][N:40]2[CH:39]=[N:38][CH:42]=[N:41]2)[CH2:4][N:5]([C:31]([O:33][C:34]([CH3:36])([CH3:35])[CH3:37])=[O:32])[CH2:6]1)=[O:15]

Participants

6

Reactant 4

HCID 11776TriphenylphosphineHCID 75555Diisopropyl diazene-1,2-dicarboxylateHCID 58355672tert-Butyl (3R,5S)-3-(hydroxymethyl)-5-[{[1-(4-methoxybutyl)-1H-benzimidazol-2-yl]carbonyl)(2-methylpropyl)amino]piperidine-1-carboxylateHCID 178420924HCID 178420924, compound

Product 1

HCID 58355363tert-butyl (3S,5R)-3-[{[1-(4-methoxybutyl)-1H-benzimidazol-2-yl]carbonyl}(2-methylpropyl)amino]-5-(1H-1,2,4-triazol-1-ylmethyl)piperidine-1-carboxylateYield 78.8%

Reagents, catalysts & solvents 1

HCID 8028TetrahydrofuranSolvent

Procedure

A solution of tert-butyl (3R,5S)-3-(hydroxymethyl)-5-[{[1-(4-methoxybutyl)-1H-benzimidazol-2-yl]carbonyl}(2-methylpropyl)amino]piperidine-1-carboxylate (208 mg), 1,3,4-triazole (52 mg), triphenylphosphine (262 mg) and diisopropyl azodicarboxylate (40% toluene solution, 632 mg) in THF (5 ml) was stirred at 50° C. for 15 hr. The reaction mixture was concentrated under reduced pressure, diluted with water and ethyl acetate, and the organic layer was separated. The organic layer was washed with saturated brine, and dried over anhydrous sodium sulfate. The solvent was evaporated under reduced pressure. The residue was subjected to silica gel column chromatography, and a fraction eluted with ethyl acetate-hexane (1:5-1:0) and ethyl acetate-methanol (1:0-9:1) was concentrated under reduced pressure. The residue was subjected to basic silica gel column chromatography, and a fraction eluted with ethyl acetate-hexane (1:9 to 3:1) was concentrated under reduced pressure to give the object product (180 mg).

Workup

  1. concentrationThe reaction mixture was concentrated under reduced pressure
  2. additiondiluted with water and ethyl acetate
  3. customthe organic layer was separated
  4. washThe organic layer was washed with saturated brine
  5. dry with materialdried over anhydrous sodium sulfate
  6. customThe solvent was evaporated under reduced pressure
  7. washa fraction eluted with ethyl acetate-hexane (1:5-1:0) and ethyl acetate-methanol (1:0-9:1)
  8. concentrationwas concentrated under reduced pressure
  9. washa fraction eluted with ethyl acetate-hexane (1:9 to 3:1)
  10. concentrationwas concentrated under reduced pressure

Sources & evidence

ORD record
ord-0510e5587e074f8087ef27a3e333ad45
Source dataset
uspto-grants-2015_06
Patent number
US09045436B2

Reaction notes

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