Trimethylsilyl iodide → 7-Hydroxy Risperidone

HRID 1656354Notes

Reaction equation

HRID 1656354 reaction equation
[F:1][C:2]1[CH:32]=[CH:31][C:5]2[C:6]([CH:9]3[CH2:14][CH2:13][N:12]([CH2:15][CH2:16][C:17]4[C:22](=[O:23])[N:21]5[CH2:24][CH:25]([O:28]C)[CH2:26][CH2:27][C:20]5=[N:19][C:18]=4[CH3:30])[CH2:11][CH2:10]3)=[N:7][O:8][C:4]=2[CH:3]=1.I[Si](C)(C)C>C(#N)C>[F:1][C:2]1[CH:32]=[CH:31][C:5]2[C:6]([CH:9]3[CH2:10][CH2:11][N:12]([CH2:15][CH2:16][C:17]4[C:22](=[O:23])[N:21]5[CH2:24][CH:25]([OH:28])[CH2:26][CH2:27][C:20]5=[N:19][C:18]=4[CH3:30])[CH2:13][CH2:14]3)=[N:7][O:8][C:4]=2[CH:3]=1

Participants

4

Reactant 2

HCID 85247Trimethylsilyl iodide2×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-one

Product 1

HCID 4751007-Hydroxy RisperidoneYield 3.7%

Reagents, catalysts & solvents 1

HCID 6342AcetonitrileSolvent

Conditions

Temperature
70 °C

Procedure

A mixture of 8.5 parts 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, 14 parts of iodotrimethylsilane and 40 parts of acetonitrile was stirred overnight at 70° C. Another portion of 2,8 parts of iodotrimethylsilane was added and the reaction mixture was stirred for a while at 90° C. and then overnight at reflux temperature. After cooling, the whole was evaporated. The residue was taken up in ethanol and the whole was evaporated again. The residue was taken up in water and treated with a sodium hydroxide solution. 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 desired fraction was collected and the eluent was evaporated. The residue was solidified in ethanol. The product was filtered off and dried, yielding 0.3 parts (3.7%) of 3-[2-[4-(6-fluoro-1,2-benzisoxazol-3-yl)-1-piperidinyl]ethyl]-6,7,8,9-tetrahydro-7-hydroxy-2-methyl-4H-pyrido[1,2-a]-pyrimidin-4-one; mp. 156.2° C. (Compound 7)

Workup

  1. stirringthe reaction mixture was stirred for a while at 90° C.
  2. temperatureovernight at reflux temperature
  3. temperatureAfter cooling
  4. customthe whole was evaporated
  5. customthe whole was evaporated again
  6. additiontreated with a sodium hydroxide solution
  7. extractionThe product was extracted with trichloromethane
  8. customThe extract was dried
  9. filtrationfiltered
  10. customevaporated
  11. customThe residue was purified by column chromatography over silica gel using
  12. additiona mixture of trichloromethane and methanol (95:5 by volume) as eluent
  13. customThe desired fraction was collected
  14. customthe eluent was evaporated
  15. filtrationThe product was filtered off
  16. customdried

Sources & evidence

ORD record
ord-715c5fadd5794b92a3c18a69ebb1bbab
Source dataset
uspto-grants-1993_10
Patent number
US05254556

Reaction notes

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