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

HRID 1498715Notes

Reaction equation

HRID 1498715 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].[O:15]([CH2:23][CH2:24][O:25][C:26]1[C:33]([CH3:34])=[CH:32][C:29]([CH:30]=O)=[CH:28][C:27]=1[CH3:35])[Si](C(C)(C)C)(C)C.OS([O-])=O.[Na+].CC1C=CC(S(O)(=O)=O)=CC=1.CCCC[N+](CCCC)(CCCC)CCCC.[F-]>CN(C)C(=O)C.C1COCC1.O>[OH:15][CH2:23][CH2:24][O:25][C:26]1[C:33]([CH3:34])=[CH:32][C:29]([C:30]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:28][C:27]=1[CH3:35]

Participants

9

Reactant 5

HCID 6101p-Toluenesulfonic acidHCID 2724141Tetrabutylammonium FluorideHCID 23665763Sodium BisulfiteHCID 666066902-Amino-4,6-dimethoxy-nicotinamideHCID 866219154-(2-(Tert-butyldimethylsilyloxy)ethoxy)-3,5-dimethylbenzaldehyde

Product 1

HCID 1360379882-[4-(2-hydroxy-ethoxy)-3,5-dimethyl-phenyl]-5,7-dimethoxy-3H-pyrido[2,3-d]pyrimidin-4-oneYield 6.6%

Reagents, catalysts & solvents 3

HCID 962WaterSolventHCID 8028TetrahydrofuranSolventHCID 31374DimethylacetamideSolvent

Conditions

Temperature
150 °C

Procedure

To a solution of 2-amino-4,6-dimethoxy-nicotinamide (1.07 g, 5.42 mmol) and 4-[2-(tert-butyldimethylsilanoxy) ethoxy]-3,5-dimethylbenzaldehyde (1.67 g, 5.42 mmol) in N,N-dimethyl acetamide (25 mL), NaHSO3 (1.06 g, 5.97 mmol) and p-TSA (1.14 g, 5.97 mmol) were added and the reaction mixture was heated at 150° C. for 16 h, cooled to room temperature and poured into water. The solid was collected to give 3.25 g of crude product. To a solution of the crude product (3.25 g, 6.70 mmol) in THF (50 mL), TBAF (3.5 g, 13.4 mmol) was added at 0° C. and the mixture was stirred at room temperature for 1 h. The reaction mixture was quenched with water. The organic layer was separated and the aqueous layer was extracted with ethyl acetate. The combined organic layers were washed with water, brine and dried over Na2SO4. The solvent was removed, and the crude was purified by column chromatography (silica gel 230-400 mesh; 2% methanol in CH2Cl2 as eluent) to give 2-(4-(2-hydroxyethoxy)-3,5-dimethylphenyl)-5,7-dimethoxypyrido[2,3-d]pyrimidin-4(3H)-one (132 mg, 6%). Selected data: MS (ES) m/z: 371.99; MP 255-256° C.

Workup

  1. temperaturecooled to room temperature
  2. customThe solid was collected
  3. customto give 3.25 g of crude product
  4. customThe reaction mixture was quenched with water
  5. customThe organic layer was separated
  6. extractionthe aqueous layer was extracted with ethyl acetate
  7. washThe combined organic layers were washed with water, brine
  8. dry with materialdried over Na2SO4
  9. customThe solvent was removed
  10. customthe crude was purified by column chromatography (silica gel 230-400 mesh; 2% methanol in CH2Cl2 as eluent)

Sources & evidence

ORD record
ord-765ce624238e423b84801cc5768fa08c
Source dataset
uspto-grants-2015_12
Patent number
US09199990B2

Reaction notes

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