3,4-Diaminopyridine → (S)-tert-butyl 2-(biphenyl-4-yl)-1-(3H-imidazo[4,5-c]pyridin-2-yl)ethylcarbamate

HRID 333343Notes

Reaction equation

HRID 333343 reaction equation
[C:1]1([C:20]2[CH:25]=[CH:24][CH:23]=[CH:22][CH:21]=2)[CH:6]=[CH:5][C:4]([CH2:7][C@H:8]([NH:12][C:13]([O:15][C:16]([CH3:19])([CH3:18])[CH3:17])=[O:14])[C:9](O)=O)=[CH:3][CH:2]=1.F[P-](F)(F)(F)(F)F.N1(O[P+](N(C)C)(N(C)C)N(C)C)C2C=CC=CC=2N=N1.CCN(C(C)C)C(C)C.[N:62]1[CH:67]=[CH:66][C:65]([NH2:68])=[C:64]([NH2:69])[CH:63]=1>CN(C=O)C.CCOC(C)=O>[C:1]1([C:20]2[CH:25]=[CH:24][CH:23]=[CH:22][CH:21]=2)[CH:6]=[CH:5][C:4]([CH2:7][C@H:8]([NH:12][C:13](=[O:14])[O:15][C:16]([CH3:19])([CH3:18])[CH3:17])[C:9]2[NH:69][C:64]3[CH:63]=[N:62][CH:67]=[CH:66][C:65]=3[N:68]=2)=[CH:3][CH:2]=1

Participants

7

Reactant 4

HCID 59183,4-DiaminopyridineHCID 81531DiisopropylethylamineHCID 151348Benzotriazol-1-yloxy-tris(dimethylamino)phosphonium hexafluorophosphateHCID 2761796N-alpha-t-Butyloxycarbonyl-L-biphenylalanine (Boc-L-Bip-OH)

Product 1

HCID 68749665(S)-tert-butyl 2-(biphenyl-4-yl)-1-(3H-imidazo[4,5-c]pyridin-2-yl)ethylcarbamate

Reagents, catalysts & solvents 2

HCID 6228DimethylformamideSolventHCID 8857Ethyl AcetateSolvent

Procedure

To a solution of (S)-3-(biphenyl-4-yl)-2-(tert-butoxycarbonylamino)propanoic acid (400 mg, 1.172 mmol) in DMF (5 mL) were added BOP (580 mg, 1.289 mmol) and DIPEA (0.246 mL, 1.406 mmol) at room temperature. After being stirred for 10 minutes, pyridine-3,4-diamine (130 mg, 1.230 mmol) was added and stirred for 1 hour. The reaction mixture was diluted with EtOAc and washed with H2O and brine. The organic layer was dried over Na2SO4, concentrated under reduced pressure, and purified by silica gel flash column chromatography (10% MeOH in DCM/DCM). The obtained residue was stirred in acetic acid (5 mL) for 4 hours. The reaction mixture was concentrated and purified by silica gel flash column chromatography to give (S)-tert-butyl 2-(biphenyl-4-yl)-1-(3H-imidazo[4,5-c]pyridin-2-yl)ethylcarbamate; 1H NMR (400 MHz, CDCl3) δ 1.41 (s, 9H), 3.33-3.56 (m, 2H), 5.18-5.27 (m, 1H), 5.37-5.48 (m, 1H), 7.22-7.29 (m, 2H), 7.30-7.36 (m, 1H), 7.42 (t, J=7.83 Hz, 2H), 7.48-7.58 (m, 4H), 7.60-7.66 (m, 1H), 8.32 (d, J=5.81 Hz, 1H), 8.94 (s, 1H); MS: m/z (MH+) 415.

Workup

  1. stirringstirred for 1 hour
  2. washwashed with H2O and brine
  3. dry with materialThe organic layer was dried over Na2SO4
  4. concentrationconcentrated under reduced pressure
  5. custompurified by silica gel flash column chromatography (10% MeOH in DCM/DCM)
  6. stirringThe obtained residue was stirred in acetic acid (5 mL) for 4 hours
  7. concentrationThe reaction mixture was concentrated
  8. custompurified by silica gel flash column chromatography

Sources & evidence

ORD record
ord-953106d223ec441084912d376cf38299
Source dataset
uspto-grants-2014_11
Patent number
US08877815B2

Reaction notes

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