Triethylamine → 2,2-Dimethyl-propionic acid 3-methoxy-9-oxo-8-(2,4,6-trimethyl-phenyl)-2,3,4,5-tetrahydro-1H,9H-pyrazolo[1,2-a][1,2,5]triazepin-7-yl ester

HRID 924599Notes

Reaction equation

HRID 924599 reaction equation
[CH3:1][O:2][N:3]1[CH2:9][CH2:8][N:7]2[C:10](=[O:23])[CH:11]([C:14]3[C:19]([CH3:20])=[CH:18][C:17]([CH3:21])=[CH:16][C:15]=3[CH3:22])[C:12](=[O:13])[N:6]2[CH2:5][CH2:4]1.C(N(CC)CC)C.[CH3:31][C:32]([CH3:37])([CH3:36])[C:33](Cl)=[O:34]>CN(C)C1C=CN=CC=1.O1CCCC1>[CH3:1][O:2][N:3]1[CH2:4][CH2:5][N:6]2[C:12](=[O:13])[C:11]([C:14]3[C:15]([CH3:22])=[CH:16][C:17]([CH3:21])=[CH:18][C:19]=3[CH3:20])=[C:10]([O:23][C:33](=[O:34])[C:32]([CH3:37])([CH3:36])[CH3:31])[N:7]2[CH2:8][CH2:9]1

Participants

6

Reactant 3

HCID 8471TriethylamineHCID 62493Pivaloyl chlorideHCID 867199153-Methoxy-8-(2,4,6-trimethyl-phenyl)-tetrahydro-pyrazolo[1,2-a][1,2,5]triazepine-7,9-dione

Product 1

HCID 867199162,2-Dimethyl-propionic acid 3-methoxy-9-oxo-8-(2,4,6-trimethyl-phenyl)-2,3,4,5-tetrahydro-1H,9H-pyrazolo[1,2-a][1,2,5]triazepin-7-yl ester

Reagents, catalysts & solvents 2

HCID 142844-(Dimethylamino)pyridineCatalystHCID 8028TetrahydrofuranSolvent

Conditions

Temperature
0 °C

Procedure

To a solution of 3-methoxy-8-(2,4,6-trimethyl-phenyl)-tetrahydro-pyrazolo[1,2-a][1,2,5]triazepine-7,9-dione (162 mg, 0.51 mmol), triethylamine (0.107 ml, 78 mg, 0.77 mmol) and a catalytic amount of 4-dimethylaminopyridine in tetrahydrofuran (4 ml) at 0° C. was added 2,2-dimethyl-propionyl chloride (pivaloyl chloride, 0.082 ml, 80 mg, 0.67 mmol) dropwise. The suspension was stirred at 0° C. for 45 minutes, the solvent evaporated and the residue diluted with ethyl acetate. The organic phase was washed with water and brine, dried over sodium sulfate and concentrated. Yield: 160 mg of 2,2-dimethyl-propionic acid 3-methoxy-9-oxo-8-(2,4,6-trimethyl-phenyl)-2,3,4,5-tetrahydro-1H,9H-pyrazolo[1,2-a][1,2,5]triazepin-7-yl ester (title compound P1.1) as an off-white solid, mp 147-148° C.

Workup

  1. customthe solvent evaporated
  2. additionthe residue diluted with ethyl acetate
  3. washThe organic phase was washed with water and brine
  4. dry with materialdried over sodium sulfate
  5. concentrationconcentrated

Sources & evidence

ORD record
ord-2f8c034b6d6d4182ba12528a86639faa
Source dataset
uspto-grants-2016_03
Patent number
US09282743B2

Reaction notes

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