Ammonia → HCID 178432143, compound

HRID 1056346Notes

Reaction equation

HRID 1056346 reaction equation
[C:1]([NH:5][C:6]1[C:7]([CH3:24])=[N:8][C:9]2[C:14]([N:15]=1)=[C:13]([C:16]1[NH:20][N:19]=[C:18]([C:21](O)=[O:22])[CH:17]=1)[CH:12]=[CH:11][CH:10]=2)([CH3:4])([CH3:3])[CH3:2].CC[N:27](C(C)C)C(C)C.N.F[P-](F)(F)(F)(F)F.N1(O[P+](N2CCCC2)(N2CCCC2)N2CCCC2)C2C=CC=CC=2N=N1>CN(C=O)C.C(Cl)Cl>[C:1]([NH:5][C:6]1[C:7]([CH3:24])=[N:8][C:9]2[C:14]([N:15]=1)=[C:13]([C:16]1[NH:20][N:19]=[C:18]([C:21]([NH2:27])=[O:22])[CH:17]=1)[CH:12]=[CH:11][CH:10]=2)([CH3:4])([CH3:2])[CH3:3]

Participants

7

Reactant 4

HCID 222AmmoniaHCID 81531DiisopropylethylamineHCID 2724699PyBOPHCID 178432145HCID 178432145, compound

Product 1

HCID 178432143HCID 178432143, compoundYield 85%

Reagents, catalysts & solvents 2

HCID 6228DimethylformamideSolventHCID 6344DichloromethaneSolvent

Procedure

To a 10-mL reaction vial was added ethyl 5-(3-(tert-butylamino)-2-methylquinoxalin-5-yl)-1H-pyrazole-3-carboxylate (467a) (94 mg, 0.27 mmol), LiOH hydrated (56 mg, 1.33 mmol), dioxane (4 mL), and water (1 mL). The reaction mixture was heated at 50° C. for 1 h and at 100° C. for 2 h and then cooled to RT. The solvent was removed under vacuum and HCl (1N, 3 mL) was added, the yellow precipitate obtained was filtered off, washed with water, and dried. 5-(3-(tert-butylamino)-2-methylquinoxalin-5-yl)-1H-pyrazole-3-carboxylic acid (467b) was obtained as a yellow solid and used without further purification. To a 50-mL round-bottomed flask was added 5-(3-(tert-butylamino)-2-methylquinoxalin-5-yl)-1H-pyrazole-3-carboxylic acid (467b) (77 mg, 0.24 mmol), DCM (3 mL), DMF (1 mL), DIPEA (82 μL, 0.47 mmol), ammonia (0.95 mL, 0.47 mmol, 0.5 M in dioxane), and (benzotriazol-1-yloxy)tripyrrolidinophosphonium hexafluorophosphate (123 mg, 0.24 mmol) (Sigma-Aldrich). The reaction mixture was stirred at RT for 30 min, concentrated to half of its volume, and diluted with EtOAc (20 mL). The organic extract was washed with sat NaHCO3 (10 mL), dried over Na2SO4, and concentrated. The crude material was absorbed onto a plug of silica gel and purified by chromatography through a Redi-Sep pre-packed silica gel column (12 g), eluting with a gradient of 30% to 40% EtOAc in hexanes to give 5-(3-(tert-butylamino)-2-methyl-quinoxalin-5-yl)-1H-pyrazole-3-carboxamide (467) (65 mg, 85% yield) as a light yellow solid. 1H NMR (400 MHz, DMSO-d6) δ 13.38 (br. s, 1H), 7.85 (dd, J=1.08, 7.34 Hz, 1H), 7.76 (d, J=7.63 Hz, 1H), 7.53 (br. s., 1H), 7.41 (t, J=7.73 Hz, 1H), 7.30 (s, 1H), 7.18 (br. s, 1H), 6.06 (br. s., 1H), 2.58 (s, 3H), 1.52 (s, 9H). m/z (ESI, +ve) 325.1 (M+H)+.

Workup

  1. customused without further purification
  2. concentrationconcentrated to half of its volume
  3. additiondiluted with EtOAc (20 mL)
  4. extractionThe organic extract
  5. washwas washed with sat NaHCO3 (10 mL)
  6. dry with materialdried over Na2SO4
  7. concentrationconcentrated
  8. customThe crude material was absorbed onto a plug of silica gel
  9. custompurified by chromatography through a Redi-Sep pre-packed silica gel column (12 g)
  10. washeluting with a gradient of 30% to 40% EtOAc in hexanes

Sources & evidence

ORD record
ord-dc7ae70c016e47d1b2213b4f6a4ab80f
Source dataset
uspto-grants-2016_07
Patent number
US09394297B2

Reaction notes

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