Potassium Iodide → 3-[2-[4-[(2-fluorophenyl)(2-phenylhydrazono)methyl]-1-piperazinyl]ethyl]-2-methyl-4H-pyrido[1,2-a]pyrimidin-4-one

HRID 2051015Notes

Reaction equation

HRID 2051015 reaction equation
Cl[CH2:2][CH2:3][C:4]1[C:9](=[O:10])[N:8]2[CH:11]=[CH:12][CH:13]=[CH:14][C:7]2=[N:6][C:5]=1[CH3:15].[F:16][C:17]1[CH:30]=[CH:29][CH:28]=[CH:27][C:18]=1[C:19]([N:21]1[CH2:26][CH2:25][NH:24][CH2:23][CH2:22]1)=O.[C:31]1([NH:37][NH2:38])[CH:36]=[CH:35][CH:34]=[CH:33][CH:32]=1.C(=O)([O-])[O-].[Na+].[Na+].[I-].[K+]>CC(C)CC(=O)C>[F:16][C:17]1[CH:30]=[CH:29][CH:28]=[CH:27][C:18]=1[C:19](=[N:38][NH:37][C:31]1[CH:36]=[CH:35][CH:34]=[CH:33][CH:32]=1)[N:21]1[CH2:26][CH2:25][N:24]([CH2:2][CH2:3][C:4]2[C:9](=[O:10])[N:8]3[CH:11]=[CH:12][CH:13]=[CH:14][C:7]3=[N:6][C:5]=2[CH3:15])[CH2:23][CH2:22]1

Participants

7

Reactant 5

HCID 4875Potassium IodideHCID 7516PhenylhydrazineHCID 10340Sodium CarbonateHCID 544862(2-Fluoro-phenyl)-piperazin-1-yl-methanoneHCID 8178663-(2-Chloroethyl)-2-methyl-4H-pyrido[1,2-a]pyrimidin-4-one

Product 1

HCID 566196993-[2-[4-[(2-fluorophenyl)(2-phenylhydrazono)methyl]-1-piperazinyl]ethyl]-2-methyl-4H-pyrido[1,2-a]pyrimidin-4-one

Reagents, catalysts & solvents 1

HCID 7909Methyl Isobutyl KetoneSolvent

Procedure

A mixture of 4.5 parts of 3-(2-chloroethyl)-2-methyl-4H-pyrido-[1,2-a]pyrimidin-4-one, 6 parts of 1-(2-fluorobenzoyl)piperazine, 2-phenylhydrazine, 5.04 parts of sodium carbonate, 0.1 parts of potassium iodide and 120 parts of 4-methyl-2-pentanone was stirred overnight at reflux temperature. The inorganic salts were filtered off and the filtrate was evaporated. The residue was purified by column chromatography over silica gel using a mixture of trichloromethane and methanol (95:5 by volume) as eluent. The pure fractions were collected and the eluent was evaporated. The residue was crystallized from 2-propanol. The product was filtered off and dried, yielding 2.5 parts (25.8) of 3-[2-[4-[(2-fluorophenyl)(2-phenylhydrazono)methyl]-1-piperazinyl]ethyl]-2-methyl-4H-pyrido[1,2-a]pyrimidin-4-one; mp. 180° C. (int. 10).

Workup

  1. temperatureat reflux temperature
  2. filtrationThe inorganic salts were filtered off
  3. customthe filtrate was evaporated
  4. customThe residue was purified by column chromatography over silica gel using
  5. additiona mixture of trichloromethane and methanol (95:5 by volume) as eluent
  6. customThe pure fractions were collected
  7. customthe eluent was evaporated
  8. customThe residue was crystallized from 2-propanol
  9. filtrationThe product was filtered off
  10. customdried

Sources & evidence

ORD record
ord-79145bf9ba0c47d08a5d7cfbfc7b49b9
Source dataset
uspto-grants-1991_05
Patent number
US05015740

Reaction notes

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