Triphenyl phosphite → Methyl 4-methyl-2-oxo-1,2,3,4-tetrahydropyrido[2,3-b]pyrazine-7-carboxylate
Reaction equation
C[O:2][C:3](=O)[CH2:4][N:5]([CH3:19])[C:6]1[C:15]([N+:16]([O-])=O)=[CH:14][C:9]([C:10]([O:12][CH3:13])=[O:11])=[CH:8][N:7]=1.P(OC1C=CC=CC=1)(OC1C=CC=CC=1)OC1C=CC=CC=1.[H][H]>ClCCl.[NH4+].[O-][V](=O)=O.[Pt]>[CH3:19][N:5]1[CH2:4][C:3](=[O:2])[NH:16][C:15]2[CH:14]=[C:9]([C:10]([O:12][CH3:13])=[O:11])[CH:8]=[N:7][C:6]1=2Participants
Reactant 3
Product 1
Reagents, catalysts & solvents 3
Procedure
Methyl 6-((2-methoxy-2-oxoethyl)(methyl)amino)-5-nitronicotinate (2.7 g, 9.53 mmol) was dissolved in dichloromethane (10 mL). To the yellow solution was added ammonium metavanadate (30.0 mg, 0.256 mmol), triphenyl phosphite (aprox 30 ul, 0.097 mmol), and Pt/C (300 mg, 5% w/w). The reaction mixture was pressurized with hydrogen gas (110 psi) and stirred at room temperature for 16 h. The reaction was then depressurized and diluted with dichloromethane (100 mL) which was then refluxed for 30 min. The hot solution was filtered through a pad of celite and washed with hot dichloromethane (3×20 mL). The filtrate was concentrated in vacuo to yield the title compound (1.45 g, 68%) as a white solid. [M+H] calc'd for C, 10; H, 11; N, 3; O, 3, 222; found, 222.
Workup
- temperaturewas then refluxed for 30 min
- filtrationThe hot solution was filtered through a pad of celite
- washwashed with hot dichloromethane (3×20 mL)
- concentrationThe filtrate was concentrated in vacuo
Sources & evidence
- ORD record
- ord-c2d0605f526540fc9726ec8bc7863351
- Source dataset
- uspto-grants-2013_05
- Patent number
- US08450323B2
Reaction notes
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