Sulfuric Acid → 6-(4-methoxy-phenyl)-8-phenyl-2-phenylamino-5,8-dihydro-6H-pyrido[2,3-d]pyrimidin-7-one

HRID 11764Notes

Reaction equation

HRID 11764 reaction equation
C[O:2][C:3](=O)[CH:4]([C:26]1[CH:31]=[CH:30][C:29]([O:32][CH3:33])=[CH:28][CH:27]=1)[CH2:5][C:6]1[C:7]([NH:19][C:20]2[CH:25]=[CH:24][CH:23]=[CH:22][CH:21]=2)=[N:8][C:9]([NH:12][C:13]2[CH:18]=[CH:17][CH:16]=[CH:15][CH:14]=2)=[N:10][CH:11]=1.S(=O)(=O)(O)O>C(O)(=O)C.C(OCC)(=O)C>[CH3:33][O:32][C:29]1[CH:30]=[CH:31][C:26]([CH:4]2[C:3](=[O:2])[N:19]([C:20]3[CH:25]=[CH:24][CH:23]=[CH:22][CH:21]=3)[C:7]3[N:8]=[C:9]([NH:12][C:13]4[CH:18]=[CH:17][CH:16]=[CH:15][CH:14]=4)[N:10]=[CH:11][C:6]=3[CH2:5]2)=[CH:27][CH:28]=1

Participants

5

Reactant 2

HCID 1118Sulfuric AcidHCID 210443163-(2,4-Diphenylamino-pyrimidin-5-yl)-2-(4-methoxy-phenyl)-propionic acid methyl ester

Product 1

HCID 100708676-(4-methoxy-phenyl)-8-phenyl-2-phenylamino-5,8-dihydro-6H-pyrido[2,3-d]pyrimidin-7-one

Reagents, catalysts & solvents 2

HCID 176Acetic AcidSolventHCID 8857Ethyl AcetateSolvent

Conditions

Temperature
80 °C

Procedure

To the solution of 3-(2,4-diphenylamino-pyrimidin-5-yl)-2-(4-methoxy-phenyl)-propionic acid methyl ester (227.3 mg, 0.5 mmol) (from Example 1e supra) in glacial acetic acid (15 mL) was added concentrated sulfuric acid (0.2 mL) in one portion. The reaction mixture was heated at 80° C. overnight. The reaction mixture was then diluted with ethyl acetate (50 mL) and quenched with 2 N aqueous sodium hydroxide solution. The organic layer was separated and successively washed with water (10 mL) and brine (10 mL), dried over anhydrous sodium sulfate, filtered, and concentrated in vacuo to give the crude products which was crystallized from ethyl acetate-hexanes to give 6-(4-methoxy-phenyl)-8-phenyl-2-phenylamino-5,8-dihydro-6H-pyrido[2,3-d]pyrimidin-7-one as brown crystalline solid. (Yield 174.2 mg, 82.4%).

Workup

  1. customquenched with 2 N aqueous sodium hydroxide solution
  2. customThe organic layer was separated
  3. washsuccessively washed with water (10 mL) and brine (10 mL)
  4. dry with materialdried over anhydrous sodium sulfate
  5. filtrationfiltered
  6. concentrationconcentrated in vacuo
  7. customto give the crude products which
  8. customwas crystallized from ethyl acetate-hexanes

Sources & evidence

ORD record
ord-72569249a4644535976a717f79b97131
Source dataset
uspto-grants-2006_08
Patent number
US07098332B2

Reaction notes

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