Pyridine → N-[5-[2-(3,5-Dimethoxyphenyl)ethyl]-1H-pyrazol-3-yl]-3-methoxy-benzamide

HRID 1092009Notes

Reaction equation

HRID 1092009 reaction equation
ClC(N(C)C)=C(C)C.[CH3:9][O:10][C:11]1[CH:12]=[C:13]([CH:17]=[CH:18][CH:19]=1)[C:14]([OH:16])=O.[NH2:20][C:21]1[N:25](C(OC(C)(C)C)=O)[N:24]=[C:23]([CH2:33][CH2:34][C:35]2[CH:40]=[C:39]([O:41][CH3:42])[CH:38]=[C:37]([O:43][CH3:44])[CH:36]=2)[CH:22]=1.N1C=CC=CC=1.C(O)(C(F)(F)F)=O>C(Cl)Cl>[CH3:42][O:41][C:39]1[CH:40]=[C:35]([CH2:34][CH2:33][C:23]2[NH:24][N:25]=[C:21]([NH:20][C:14](=[O:16])[C:13]3[CH:17]=[CH:18][CH:19]=[C:11]([O:10][CH3:9])[CH:12]=3)[CH:22]=2)[CH:36]=[C:37]([O:43][CH3:44])[CH:38]=1

Participants

7

Reactant 5

HCID 1049PyridineHCID 6422Trifluoroacetic acidHCID 114613-Methoxybenzoic AcidHCID 6407921-Chloro-N,N-2-trimethylpropenylamineHCID 57440371Tert-butyl 5-amino-3-[2-(3,5-dimethoxyphenyl)ethyl]pyrazole-1-carboxylate

Product 1

HCID 66589702N-[5-[2-(3,5-Dimethoxyphenyl)ethyl]-1H-pyrazol-3-yl]-3-methoxy-benzamideYield 59.3%

Reagents, catalysts & solvents 1

HCID 6344DichloromethaneSolvent3×

Procedure

1-Chloro-N,N,2-trimethylprop-1-en-1-amine (89 μl, 0.67 mmol, 1.05 eq) was added dropwise to 3-methoxybenzoic acid (97 mg, 0.63 mmol, 1 eq) in DCM (1.5 ml) at ambient temperature. After stirring at ambient temperature for 1.5 h, a solution of tert-butyl 5-amino-3-[2-(3,5-dimethoxyphenyl)ethyl]-1H-pyrazole-1-carboxylate (199 mg, 0.57 mmol, 0.9 eq) and pyridine (142 μL, 1.74 mmol, 2.75 eq) in DCM (2 ml) was added to the reaction mixture and stirring was continued at ambient temperature for a further 3 h. A solution of TFA (386 μL, 5.2 mmol, 8.25 eq) in DCM (3.5 ml) was then added and stirring was continued at ambient temperature for 18 h. The reaction mixture was concentrated and the crude product was purified by reverse-phase prep. HPLC (basic) using a gradient of acetonitrile in water containing 1% ammonium hydroxide solution. The clean fractions were taken and evaporated to afford the title compound as a colourless solid (129 mg, 59% yield). 1H NMR (399.902 MHz, DMSO) δ 2.89 (4H, s), 3.73 (6H, s), 3.84 (3H, s), 6.34-6.33 (1H, m), 6.43 (2H, d), 6.48 (1H, s), 7.12-7.10 (1H, m), 7.42-7.37 (1H, m), 7.59-7.56 (2H, m), 10.65 (1H, br.s), 12.16 (1H, br.s). MS: m/z 382 (MH+).

Workup

  1. stirringstirring
  2. waitwas continued at ambient temperature for a further 3 h
  3. stirringstirring
  4. waitwas continued at ambient temperature for 18 h
  5. concentrationThe reaction mixture was concentrated
  6. customthe crude product was purified by reverse-phase prep
  7. customevaporated

Sources & evidence

ORD record
ord-5618b19d4a3746dc9f5f178dc5427b00
Source dataset
uspto-grants-2012_03
Patent number
US08129391B2

Reaction notes

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