Trifluoroacetic acid → (2S)-1-[4-[5-[5-amino-6-(5-tert-butyl-1,3,4-oxadiazol-2-yl)pyrazin-2-yl]-1-ethyl-1,2,4-triazol-3-yl]-1-piperidyl]-2,3-dihydroxy-propan-1-one

HRID 1749694Notes

Reaction equation

HRID 1749694 reaction equation
[NH2:1][C:2]1[N:3]=[CH:4][C:5]([C:17]2[N:21]([CH2:22][CH3:23])[N:20]=[C:19]([CH:24]3[CH2:29][CH2:28][N:27]([C:30]([C@@H:32]4[CH2:36][O:35]C(C)(C)[O:33]4)=[O:31])[CH2:26][CH2:25]3)[N:18]=2)=[N:6][C:7]=1[C:8]1[O:9][C:10]([C:13]([CH3:16])([CH3:15])[CH3:14])=[N:11][N:12]=1.C(O)(C(F)(F)F)=O>C(Cl)Cl>[NH2:1][C:2]1[N:3]=[CH:4][C:5]([C:17]2[N:21]([CH2:22][CH3:23])[N:20]=[C:19]([CH:24]3[CH2:29][CH2:28][N:27]([C:30](=[O:31])[C@@H:32]([OH:33])[CH2:36][OH:35])[CH2:26][CH2:25]3)[N:18]=2)=[N:6][C:7]=1[C:8]1[O:9][C:10]([C:13]([CH3:15])([CH3:16])[CH3:14])=[N:11][N:12]=1

Participants

4

Reactant 2

HCID 6422Trifluoroacetic acidHCID 86727675(S)-(4-(5-(5-amino-6-(5-(tert-butyl)-1,3,4-oxadiazol-2-yl)pyrazin-2-yl)-1-ethyl-1H-1,2,4-triazol-3-yl)piperidin-1-yl)(2,2-dimethyl-1,3-dioxolan-4-yl)methanone

Product 1

HCID 86727676(2S)-1-[4-[5-[5-amino-6-(5-tert-butyl-1,3,4-oxadiazol-2-yl)pyrazin-2-yl]-1-ethyl-1,2,4-triazol-3-yl]-1-piperidyl]-2,3-dihydroxy-propan-1-oneYield 48%

Reagents, catalysts & solvents 1

HCID 6344DichloromethaneSolvent

Procedure

To a mixture of 3-(5-(tert-butyl)-1,3,4-oxadiazol-2-yl)-5-(1-ethyl-3-(piperidin-4-yl)-1H-1,2,4-triazol-5-yl)pyrazin-2-amine (257 mg, 0.50 mmol, TFA salt), potassium (S)-2,2-dimethyl-1,3-dioxolane-4-carboxylate (101 mg, 0.55 mmol) and EDCI (105 mg, 0.55 mmol) in DCM (5 mL) were added 1-hydroxy-1H-benzotriazol hydrate (85 mg, 0.56 mmol) and DIPEA (194 mg, 1.50 mmol). The mixture was stirred for 16 hours at room temperature. Water was added to the mixture and the mixture was extracted with DCM. The organic layers were washed with brine and dried over Na2SO4, filtered and concentrated to give (S)-(4-(5-(5-amino-6-(5-(tert-butyl)-1,3,4-oxadiazol-2-yl)pyrazin-2-yl)-1-ethyl-1H-1,2,4-triazol-3-yl)piperidin-1-yl)(2,2-dimethyl-1,3-dioxolan-4-yl)methanone (320 mg). Mass Spectrum [M+H]+=526. To a mixture of (S)-(4-(5-(5-amino-6-(5-(tert-butyl)-1,3,4-oxadiazol-2-yl)pyrazin-2-yl)-1-ethyl-1H-1,2,4-triazol-3-yl)piperidin-1-yl)(2,2-dimethyl-1,3-dioxolan-4-yl)methanone (320 mg) in DCM (10 mL) at r.t was added dropwise TFA (1.6 ml, 20.77 mmol). The mixture was stirred for 16 h at r.t, concentrated and purified by preparative HPLC (Waters XBridge Prep C18 OBD column, 5μ silica, 19 mm diameter, 100 mm length) using decreasingly polar mixtures of water (containing 0.1% NH3) and MeCN as the eluant. The fractions containing the desired compound were evaporated to dryness to afford the title compound (142 mg, 48%) as a white solid. 1H NMR Spectrum (400 Hz, DMSO-d6, 30° C.): 1.45 (12H, m), 1.56 (1H, m), 1.70 (1H, m), 1.98 (2H, m), 2.85 (1H, m), 3.00 (1H, m), 3.20 (1H, m), 3.45 (1H, s), 3.55 (1H, s), 4.05 (1H, m), 4.35 (2H, m), 4.60 (2H, m), 4.70 (1H, m), 4.85 (1H, m), 7.90 (2H, m), 8.85 (1H, s); Mass Spectrum [M+H]+=486.

Workup

  1. concentrationconcentrated
  2. custompurified by preparative HPLC (Waters XBridge Prep C18 OBD column, 5μ silica, 19 mm diameter, 100 mm length)
  3. additionThe fractions containing the desired compound
  4. customwere evaporated to dryness

Sources & evidence

ORD record
ord-7a96eb011f384289b851e1985c985966
Source dataset
uspto-grants-2015_10
Patent number
US09156831B2

Reaction notes

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