Diisopropylamine → 3-{2-[4-(6-Fluoro-1,2-benzoxazol-3-yl)piperidin-1-yl]ethyl}-7-methoxy-2-methyl-6,7,8,9-tetrahydro-4H-pyrido[1,2-a]pyrimidin-4-one

HRID 467000Notes

Reaction equation

HRID 467000 reaction equation
Cl[CH2:2][CH2:3][C:4]1[C:9](=[O:10])[N:8]2[CH2:11][CH:12]([O:15][CH3:16])[CH2:13][CH2:14][C:7]2=[N:6][C:5]=1[CH3:17].Cl.[F:19][C:20]1[CH:34]=[CH:33][C:23]2[C:24]([CH:27]3[CH2:32][CH2:31][NH:30][CH2:29][CH2:28]3)=[N:25][O:26][C:22]=2[CH:21]=1.CC(NC(C)C)C>CO>[F:19][C:20]1[CH:34]=[CH:33][C:23]2[C:24]([CH:27]3[CH2:28][CH2:29][N:30]([CH2:2][CH2:3][C:4]4[C:9](=[O:10])[N:8]5[CH2:11][CH:12]([O:15][CH3:16])[CH2:13][CH2:14][C:7]5=[N:6][C:5]=4[CH3:17])[CH2:31][CH2:32]3)=[N:25][O:26][C:22]=2[CH:21]=1

Participants

5

Reactant 3

HCID 7912DiisopropylamineHCID 11334359R-56109 hydrochlorideHCID 183536393-(2-Chloroethyl)-7-methoxy-2-methyl-6,7,8,9-tetrahydro-4H-pyrido[1,2-a]pyrimidin-4-one

Product 1

HCID 183536403-{2-[4-(6-Fluoro-1,2-benzoxazol-3-yl)piperidin-1-yl]ethyl}-7-methoxy-2-methyl-6,7,8,9-tetrahydro-4H-pyrido[1,2-a]pyrimidin-4-oneYield 100%

Reagents, catalysts & solvents 1

HCID 887MethanolSolvent

Procedure

A mixture of 6 parts of 3-(2-chloroethyl)-6,7,8,9-tetrahydro-7-methoxy-2-methyl-4H-pyrido[1,2-a]pyrimidin-4-one, 4.8 parts of 6-fluoro-3-(4-piperidinyl)-1,2-benzisoxazole monohydrochloride, 6.1 parts of N-(1-methylethyl)-2-propanamine and 16 parts of methanol was stirred overnight at reflux temperature. The reaction mixture was evaporated and the residue was taken up in water. The product was extracted with trichloromethane. The extract was dried, filtered and 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, yielding 8.5 parts (100%) of 3-[2-[4-(6-fluoro-1,2-benzisoxazol-3-yl)-1-piperidinyl]ethyl]-6,7,8,9-tetrahydro-7-methoxy-2-methyl-4H-pyrido[1,2-a]-pyrimidin-4-one as an oily residue. (intermediate 5)

Workup

  1. temperatureat reflux temperature
  2. customThe reaction mixture was evaporated
  3. extractionThe product was extracted with trichloromethane
  4. customThe extract was dried
  5. filtrationfiltered
  6. customevaporated
  7. customThe residue was purified by column chromatography over silica gel using
  8. additiona mixture of trichloromethane and methanol (95:5 by volume) as eluent
  9. customThe pure fractions were collected
  10. customthe eluent was evaporated

Sources & evidence

ORD record
ord-636d5fe58c354e73902d39e2ebe7aeb1
Source dataset
uspto-grants-1992_10
Patent number
US05158952

Reaction notes

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