Dimethylformamide → 4-[8-Chloro-1-(2-phenyl-quinolin-7-yl)-imidazo[1,5-a]pyrazin-3-yl]-piperidine-1-carboxylic acid benzyl ester

HRID 244107Notes

Reaction equation

HRID 244107 reaction equation
[CH2:1]([O:8][C:9]([N:11]1[CH2:16][CH2:15][CH:14]([C:17](=O)[NH:18][CH:19]([C:36]2[C:41]([Cl:42])=[N:40][CH:39]=[CH:38][N:37]=2)[C:20]2[CH:29]=[C:28]3[C:23]([CH:24]=[CH:25][C:26]([C:30]4[CH:35]=[CH:34][CH:33]=[CH:32][CH:31]=4)=[N:27]3)=[CH:22][CH:21]=2)[CH2:13][CH2:12]1)=[O:10])[C:2]1[CH:7]=[CH:6][CH:5]=[CH:4][CH:3]=1.CN(C=O)C.O=P(Cl)(Cl)Cl>CC#N>[CH2:1]([O:8][C:9]([N:11]1[CH2:12][CH2:13][CH:14]([C:17]2[N:37]3[CH:38]=[CH:39][N:40]=[C:41]([Cl:42])[C:36]3=[C:19]([C:20]3[CH:29]=[C:28]4[C:23]([CH:24]=[CH:25][C:26]([C:30]5[CH:35]=[CH:34][CH:33]=[CH:32][CH:31]=5)=[N:27]4)=[CH:22][CH:21]=3)[N:18]=2)[CH2:15][CH2:16]1)=[O:10])[C:2]1[CH:7]=[CH:6][CH:5]=[CH:4][CH:3]=1

Participants

5

Reactant 3

HCID 6228DimethylformamideHCID 24813Phosphorus oxychlorideHCID 576810294-{[(3-Chloro-pyrazin-2-yl)-(2-phenyl-quinolin-7-yl)-methyl]carbamoyl}-piperidine-1-carboxylic acid benzyl ester

Product 1

HCID 536290294-[8-Chloro-1-(2-phenyl-quinolin-7-yl)-imidazo[1,5-a]pyrazin-3-yl]-piperidine-1-carboxylic acid benzyl ester

Reagents, catalysts & solvents 1

HCID 6342AcetonitrileSolvent

Conditions

Temperature
55 °C

Procedure

4-{[(3-Chloro-pyrazin-2-yl)-(2-phenyl-quinolin-7-yl)-methyl]-carbamoyl}-piperidine-1-carboxylic acid benzyl ester (2.1 g, 3.6 mmol) was dissolved in CH3CN (126.0 mL) and DMF (0.4 mL) in a round bottom flask equipped with a condenser. The reaction was charged with POCl3 (1.7 mL, 17.9 mmol) and stirred at 55° C. for 3 h. The reaction mixture was concentrated in vacuo, redissolved in DCM, cooled to 0° C., and charged with 2M NH3 in isopropanol to basic pH. Hydromatrix was added, the mixture was concentrated in vacuo, and the resulting residue was purified by silica gel chromatography (Jones Flashmaster, 20 g/70 mL cartridge, eluting with 100% CH2Cl2 to 2% CH3CN/CH2Cl2) to afford 4-[8-chloro-1-(2-phenyl-quinolin-7-yl)-imidazo[1,5-a]pyrazin-3-yl]-piperidine-1-carboxylic acid benzyl ester as a yellow solid; MS (ES+): m/z 574 (100) [MH+]; HPLC: tR=4.2 min (OpenLynx, polar 5 min).

Workup

  1. concentrationThe reaction mixture was concentrated in vacuo
  2. dissolutionredissolved in DCM
  3. temperaturecooled to 0° C.
  4. additioncharged with 2M NH3 in isopropanol to basic pH
  5. additionHydromatrix was added
  6. concentrationthe mixture was concentrated in vacuo
  7. customthe resulting residue was purified by silica gel chromatography (Jones Flashmaster, 20 g/70 mL cartridge, eluting with 100% CH2Cl2 to 2% CH3CN/CH2Cl2)

Sources & evidence

ORD record
ord-5f50240e35b94171a4259e51801be895
Source dataset
uspto-grants-2014_02
Patent number
US08653268B2

Reaction notes

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