Potassium Phosphate, Tribasic → Tert-butyl 4-(3-cyclopropyl-2-fluorobenzoyl)piperazine-1-carboxylate

HRID 1725511Notes

Reaction equation

Br[C:2]1[C:3]([F:23])=[C:4]([CH:20]=[CH:21][CH:22]=1)[C:5]([N:7]1[CH2:12][CH2:11][N:10]([C:13]([O:15][C:16]([CH3:19])([CH3:18])[CH3:17])=[O:14])[CH2:9][CH2:8]1)=[O:6].[CH:24]1(B(O)O)[CH2:26][CH2:25]1.C1(P(C2CCCCC2)C2CCCCC2)CCCCC1.P([O-])([O-])([O-])=O.[K+].[K+].[K+]>C1(C)C=CC=CC=1.O.C([O-])(=O)C.[Pd+2].C([O-])(=O)C>[CH:24]1([C:2]2[C:3]([F:23])=[C:4]([CH:20]=[CH:21][CH:22]=2)[C:5]([N:7]2[CH2:12][CH2:11][N:10]([C:13]([O:15][C:16]([CH3:19])([CH3:18])[CH3:17])=[O:14])[CH2:9][CH2:8]2)=[O:6])[CH2:26][CH2:25]1

Participants

Conditions

Temperature: 150 °C

Procedure

To a solution of 107 mg of tert-butyl 4-(3-bromo-2-fluorobenzoyl)piperazine-1-carboxylate in 2.0 ml of toluene and 0.1 ml of water was added 72 mg of cyclopropylboronic acid, 3.2 mg of palladium acetate, 0.052 ml of tricyclohexylphosphine (15% toluene solution) and 207 mg of potassium phosphate, successively. The reaction solution was stirred at 150° C. for 10 minutes using a microwave reaction apparatus. Water was added to the reaction mixture, and the mixture was extracted with ethyl acetate. The organic layer was washed with brine and then concentrated. The residue was purified by a silica gel column chromatography (eluent: hexane to hexane/ethyl acetate=1/1) to give the title compound.

Workup

customa microwave reaction apparatus
extractionthe mixture was extracted with ethyl acetate
washThe organic layer was washed with brine
concentrationconcentrated
customThe residue was purified by a silica gel column chromatography (eluent: hexane to hexane/ethyl acetate=1/1)

Sources & evidence

ORD record: ord-fc6016df2a674420a3ce9f64387adc37
Source dataset: uspto-grants-2009_02
DOI: 10.6084/m9.figshare.5104873.v1
Patent number: US07491720B2

Reaction notes

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