Ammonium formate → 3-Phenyl-2-p-tolyl-5,6,7,8-tetrahydropyrido[2,3-b]pyrazine

Reaktionsgleichung

[C:1]1([C:7]2[N:12]=[C:11]3[N:13]=[CH:14][CH:15]=[CH:16][C:10]3=[N:9][C:8]=2[C:17]2[CH:22]=[CH:21][C:20]([CH3:23])=[CH:19][CH:18]=2)[CH:6]=[CH:5][CH:4]=[CH:3][CH:2]=1.C([O-])=O.[NH4+]>CO.[Pd]>[C:1]1([C:7]2[N:12]=[C:11]3[NH:13][CH2:14][CH2:15][CH2:16][C:10]3=[N:9][C:8]=2[C:17]2[CH:18]=[CH:19][C:20]([CH3:23])=[CH:21][CH:22]=2)[CH:6]=[CH:5][CH:4]=[CH:3][CH:2]=1

Komponenten

Versuchsvorschrift

3-Phenyl-2-p-tolylpyrido[2,3-b]pyrazine (step 4) (179 mg, 0.602 mmol) under nitrogen in dry MeOH (5 ml) was treated with ammonium formate (190 mg, 3.01 mmol) and 10% palladium on carbon (64.1 mg, 0.060 mmol). The resulting mixture was heated at reflux for 16 hours. After cooling to RT, the mixture was filtered through Celite® (filter material) and the catalyst was washed with MeOH and MeOH/DCM (1:1). The filtrate was concentrated in vacuo and dissolved in DCM (50 ml). The solution was washed with water (×2) and brine (×1). The resulting organic portion was passed through a phase separating column and concentrated in vacuo to afford the titled compound;