p-Toluenesulfonic acid → 2-[4-(2-hydroxy-ethoxy)-3,5-dimethyl-phenyl]-5,7-dimethoxy-3H-pyrido[2,3-d]pyrimidin-4-one

HRID 591760Notes

Reaction equation

[NH2:1][C:2]1[N:10]=[C:9]([O:11][CH3:12])[CH:8]=[C:7]([O:13][CH3:14])[C:3]=1[C:4]([NH2:6])=[O:5].[OH:15][CH2:16][CH2:17][O:18][C:19]1[C:26]([CH3:27])=[CH:25][C:22]([CH:23]=O)=[CH:21][C:20]=1[CH3:28].OS([O-])=O.[Na+].CC1C=CC(S(O)(=O)=O)=CC=1>CN(C)C(=O)C>[OH:15][CH2:16][CH2:17][O:18][C:19]1[C:26]([CH3:27])=[CH:25][C:22]([C:23]2[NH:6][C:4](=[O:5])[C:3]3[C:7]([O:13][CH3:14])=[CH:8][C:9]([O:11][CH3:12])=[N:10][C:2]=3[N:1]=2)=[CH:21][C:20]=1[CH3:28]

Participants

Conditions

Temperature: 146.5 °C

Procedure

To a solution of 2-amino-4,6-dimethoxy-nicotinamide (0.60 g, 3.00 mmol) and 4-(2-hydroxy-ethoxy)-3,5-dimethyl-benzaldehyde (0.59 g, 3.00 mmol) in N,N-dimethylacetamide (8 mL) was added NaHSO3 (58.5 wt %, 0.59 g, 3.30 mmol) and p-TSA (0.22 g, 1.20 mmol). The reaction mixture was heated to 145-148° C. for 16 hours, then cooled to room temperature. N,N-dimethylacetamide was removed under reduced pressure, the residue was diluted with sodium bicarbonate solution (50 mL), and the solid separated was filtered and dried under vacuum. The crude compound was purified by column chromatography (silica gel 230-400 mesh; 5% methanol in dichloromethane as eluent) to give 2-[4-(2-hydroxy-ethoxy)-3,5-dimethyl-phenyl]-5,7-dimethoxy-3H-pyrido[2,3-d]pyrimidin-4-one as a white solid. Yield: 0.50 g (49%).

Workup

temperaturecooled to room temperature
customN,N-dimethylacetamide was removed under reduced pressure
additionthe residue was diluted with sodium bicarbonate solution (50 mL)
customthe solid separated
filtrationwas filtered
customdried under vacuum
customThe crude compound was purified by column chromatography (silica gel 230-400 mesh; 5% methanol in dichloromethane as eluent)

Sources & evidence

ORD record: ord-8c7b9aa02f054b68acb02fda2809f000
Source dataset: uspto-grants-2016_01
DOI: 10.6084/m9.figshare.5104873.v1
Patent number: US09238640B2

Reaction notes

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