Sodium borohydride → HCID 18917620, compound

HRID 1291749Notes

Reaction equation

HRID 1291749 reaction equation
[CH2:1]([C:3]1[S:7][C:6]([N:8]2[C:12]([CH2:13][CH2:14]CCCCCCCCC)=[N:11][N:10]=[C:9]2[CH2:24][OH:25])=[C:5]([C:26](=O)[C:27]2[CH:32]=[CH:31][C:30]([OH:33])=[CH:29][CH:28]=2)[CH:4]=1)[CH3:2].[BH4-].[Na+]>C(O)C>[CH2:1]([C:3]1[S:7][C:6]2[N:8]3[C:12]([CH2:13][CH2:14][CH2:2][CH2:1][CH2:3][CH2:4][CH2:5][CH2:26][CH2:27][CH2:28][CH3:29])=[N:11][N:10]=[C:9]3[CH2:24][O:25][CH:26]([C:27]3[CH:28]=[CH:29][C:30]([OH:33])=[CH:31][CH:32]=3)[C:5]=2[CH:4]=1)[CH3:2]

Participants

4

Reactant 2

HCID 4311764Sodium borohydrideHCID 18917609HCID 18917609, compound

Product 1

HCID 18917620HCID 18917620, compoundYield 122.2%

Reagents, catalysts & solvents 1

HCID 702EthanolSolvent

Procedure

5-Ethyl-3-(4-hydroxybenzoyl)-2-(3-hydroxymethyl-5-undecyl-1,2,4-triazol-4-yl)thiophene (11 g) obtained in Example 21 was dissolved in ethanol (60 ml). Thereto was added sodium borohydride (431 mg) with stirring and the mixture was stirred at room temperature for 1 hour. After the ethanol was distilled away, 5% aqueous sodium hydrogencarbonate was added to the residue and the liberated oily substance was extracted with ethyl acetate. The extract was washed with water and dried over anhydrous magnesium sulfate. After filtration, the filtrate was concentrated under reduced pressure and toluene (150 ml) was added to the residue. The mixture was refluxed under heating with stirring and sulfuric acid was gradually added dropwise until the reaction ended. After cooling, 5% aqueous sodium hydrogencarbonate was added thereto and the mixture was extracted with ethyl acetate. The extract was washed with water and dried over anhydrous magnesium sulfate. After filtration, the filtrate was concentrated under reduced pressure and the oily substance obtained was crystallized from isopropyl ether-ethyl acetate (4:1) to give 6.5 g of 2-ethyl-4-(4-hydroxy-phenyl)-9-undecyl-4H,6H-thieno[2,3-e][1,2,4]triazolo[3,4-c][1,4]oxazepine as white brown crystals, melting point 96°-98° C.

Workup

  1. stirringthe mixture was stirred at room temperature for 1 hour
  2. distillationAfter the ethanol was distilled away
  3. addition5% aqueous sodium hydrogencarbonate was added to the residue
  4. extractionthe liberated oily substance was extracted with ethyl acetate
  5. washThe extract was washed with water
  6. dry with materialdried over anhydrous magnesium sulfate
  7. filtrationAfter filtration
  8. concentrationthe filtrate was concentrated under reduced pressure and toluene (150 ml)
  9. additionwas added to the residue
  10. temperatureThe mixture was refluxed
  11. temperatureunder heating
  12. stirringwith stirring
  13. additionsulfuric acid was gradually added dropwise until the reaction
  14. temperatureAfter cooling
  15. addition5% aqueous sodium hydrogencarbonate was added
  16. extractionthe mixture was extracted with ethyl acetate
  17. washThe extract was washed with water
  18. dry with materialdried over anhydrous magnesium sulfate
  19. filtrationAfter filtration
  20. concentrationthe filtrate was concentrated under reduced pressure
  21. customthe oily substance obtained
  22. customwas crystallized from isopropyl ether-ethyl acetate (4:1)

Sources & evidence

ORD record
ord-a907df99b8a742b2b305575ccbba4d5f
Source dataset
uspto-grants-1998_05
Patent number
US05753649

Reaction notes

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