Trifluoroacetic acid → (S)-N-(3,3-dimethyl-1-(methylamino)-1-oxobutan-2-yl)-3-phenyl-5,6,7,8-tetrahydroimidazo[1,5-a]pyrazine-1-carboxamide

HRID 535920Notes

Reaction equation

HRID 535920 reaction equation
[CH3:1][C:2]([CH3:34])([CH3:33])[C@H:3]([NH:8][C:9]([C:11]1[N:12]=[C:13]([C:27]2[CH:32]=[CH:31][CH:30]=[CH:29][CH:28]=2)[N:14]2[CH2:19][CH2:18][N:17](C(OC(C)(C)C)=O)[CH2:16][C:15]=12)=[O:10])[C:4]([NH:6][CH3:7])=[O:5].C(O)(C(F)(F)F)=O>C(Cl)Cl>[CH3:1][C:2]([CH3:34])([CH3:33])[C@H:3]([NH:8][C:9]([C:11]1[N:12]=[C:13]([C:27]2[CH:28]=[CH:29][CH:30]=[CH:31][CH:32]=2)[N:14]2[CH2:19][CH2:18][NH:17][CH2:16][C:15]=12)=[O:10])[C:4]([NH:6][CH3:7])=[O:5]

Participants

4

Reactant 2

HCID 6422Trifluoroacetic acidHCID 25132454(S)-tert-butyl 1-(3,3-dimethyl-1-(methylamino)-1-oxobutan-2-ylcarbamoyl)-3-phenyl-5,6-dihydroimidazo[1,5-a]pyrazine-7(8H)-carboxylate

Product 1

HCID 25132789(S)-N-(3,3-dimethyl-1-(methylamino)-1-oxobutan-2-yl)-3-phenyl-5,6,7,8-tetrahydroimidazo[1,5-a]pyrazine-1-carboxamideYield 85%

Reagents, catalysts & solvents 1

HCID 6344DichloromethaneSolvent

Procedure

Compound 1 (150 mg, 0.32 mmol) was dissolved in DCM and TFA (0.25 mL, 3.20 mmol) was added. The resulting mixture was stirred overnight. The mixture was concentrated, diluted with DCM and washed with saturated NaHCO3 solution. The filtrate was dried anhydrous Na2SO4, filtered and concentrated. The residue was purified by normal phase chromatography, eluting with 0-30% 1M methanolic ammonia/dichloromethane to give desired product, Compound 2 as a white solid (0.10 g, 85%). MS: m/z 370.2 [M+H]+. 1H-NMR (400 MHz, CD3OD) δ: 1.05 (s, 9H), 2.76 (s, 3H), 3.16 (m, 2H), 4.11 (m, 2H), 4.37 (m, 3H), 7.53 (m, 3H), 7.71 (m, 2H).

Workup

  1. concentrationThe mixture was concentrated
  2. additiondiluted with DCM
  3. washwashed with saturated NaHCO3 solution
  4. filtrationfiltered
  5. concentrationconcentrated
  6. customThe residue was purified by normal phase chromatography
  7. washeluting with 0-30% 1M methanolic ammonia/dichloromethane

Sources & evidence

ORD record
ord-231ba4d8adc84549be54a2cfc1bf9be4
Source dataset
uspto-grants-2014_10
Patent number
US08859538B2

Reaction notes

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