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 2110190Notes

Reaction equation

HRID 2110190 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-b2a08d38f6c94a8ca8adb67221e07f08
Source dataset
uspto-grants-2009_04
Patent number
US07517874B2

Reaction notes

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