Diisopropylethylamine → (S)-tert-butyl 3-bromo-1-(3,3-dimethyl-1-(methylamino)-1-oxobutan-2-ylcarbamoyl)-5,6-dihydroimidazo[1,5-a]pyrazine-7(8H)-carboxylate

HRID 1971075Notes

Reaction equation

HRID 1971075 reaction equation
[Br:1][C:2]1[N:6]2[CH2:7][CH2:8][N:9]([C:11]([O:13][C:14]([CH3:17])([CH3:16])[CH3:15])=[O:12])[CH2:10][C:5]2=[C:4]([C:18]([OH:20])=O)[N:3]=1.[CH3:21][NH:22][C:23](=[O:30])[C@H:24]([C:26]([CH3:29])([CH3:28])[CH3:27])[NH2:25].CCN(C(C)C)C(C)C.CN(C(ON1N=NC2C=CC=CC1=2)=[N+](C)C)C.F[P-](F)(F)(F)(F)F>CN(C=O)C.O>[Br:1][C:2]1[N:6]2[CH2:7][CH2:8][N:9]([C:11]([O:13][C:14]([CH3:15])([CH3:16])[CH3:17])=[O:12])[CH2:10][C:5]2=[C:4]([C:18](=[O:20])[NH:25][C@@H:24]([C:26]([CH3:29])([CH3:28])[CH3:27])[C:23]([NH:22][CH3:21])=[O:30])[N:3]=1

Participants

7

Reactant 4

HCID 81531DiisopropylethylamineHCID 445856(2S)-2-Amino-N,3,3-trimethylbutanamideHCID 2733084Methanaminium, N-((1H-benzotriazol-1-yloxy)(dimethylamino)methylene)-N-methyl-, hexafluorophosphate(1-) (1:1)HCID 576354283-bromo-7-[(tert-butoxy)carbonyl]-5H,6H,7H,8H-imidazo[1,5-a]pyrazine-1-carboxylic acid

Product 1

HCID 57635359(S)-tert-butyl 3-bromo-1-(3,3-dimethyl-1-(methylamino)-1-oxobutan-2-ylcarbamoyl)-5,6-dihydroimidazo[1,5-a]pyrazine-7(8H)-carboxylateYield 80.4%

Reagents, catalysts & solvents 2

HCID 962WaterSolventHCID 6228DimethylformamideSolvent

Procedure

Acid Intermediate 1I (0.62 g, 1.79 mmol) was dissolved in DMF and L-tert-Leucine methylamide (0.31 g, 2.14 mmol) was added followed by DIEA (0.94 mL, 5.37 mmol). The resulting mixture was stirred for 20 minutes, HBTU (0.75 g, 1.97 mmol) was added in one portion and the mixture was stirred overnight. The mixture was diluted with water and extracted with ethyl acetate. The organic layer was washed successively with water, then brine, and dried over anhydrous Na2SO4, filtered and concentrated. The residue was purified by normal phase chromatography, eluting with a 0-10% methanol/DCM gradient to provide product Intermediate 1J as an off-white solid (0.68 g, 80%).

Workup

  1. stirringthe mixture was stirred overnight
  2. extractionextracted with ethyl acetate
  3. washThe organic layer was washed successively with water
  4. dry with materialbrine, and dried over anhydrous Na2SO4
  5. filtrationfiltered
  6. concentrationconcentrated
  7. customThe residue was purified by normal phase chromatography
  8. washeluting with a 0-10% methanol/DCM gradient

Sources & evidence

ORD record
ord-feb25039bb1f44ce8e03314dcf9579bf
Source dataset
uspto-grants-2013_04
Patent number
US08431565B2

Reaction notes

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