Furfural → HCID 178513717, compound

HRID 527314Notes

Reaction equation

HRID 527314 reaction equation
[NH2:1][C:2]1[NH:6][N:5]=[C:4]([NH:7][C:8]2[CH:13]=[CH:12][CH:11]=[C:10]([Cl:14])[CH:9]=2)[C:3]=1[C:15]([NH2:17])=[O:16].[O:18]1[CH:22]=[CH:21][CH:20]=[C:19]1[CH:23]=O.[BH4-].[Na+]>CCO.N1CCCCC1>[Cl:14][C:10]1[CH:9]=[C:8]([NH:7][C:4]2[C:3]([C:15]([NH2:17])=[O:16])=[C:2]([NH:1][CH2:23][C:19]3[O:18][CH:22]=[CH:21][CH:20]=3)[NH:6][N:5]=2)[CH:13]=[CH:12][CH:11]=1

Participants

6

Reactant 3

HCID 7362FurfuralHCID 4311764Sodium borohydrideHCID 866989565-amino-3-((3-chlorophenyl)amino)-1H-pyrazole-4-carboxamide

Product 1

HCID 178513717HCID 178513717, compoundYield 38%

Reagents, catalysts & solvents 2

HCID 8082PiperidineCatalystHCID 702EthanolSolvent

Procedure

5-amino-3-((3-chlorophenyl)amino)-1H-pyrazole-4-carboxamide (100 mg) was suspended in EtOH (4 mL) and 2-Furaldehyde (1 eq.) and piperidine (1 drop) were added. Stirred at reflux until intermediate was absent (HPLC). After reaction was complete (18 hrs) it was brought to room temperature and filtered to obtain product as a yellow powder. Powder was washed with EtOH. Product was allowed to dry under vacuum for 1 hr. Resulting imine (100 mg) was suspended in 5 mL MeOH and sodium borohydride (10 eq.) was added. HPLC confirmed reaction was complete (absence of imine). After completion (1 hr), precipitate was filtered to obtain D96 as a light yellow powder. Product was washed with deionized water to remove excess sodium borohydride. Product was allowed to dry under vacuum for 18 hrs. 40 mg (38% yield) of final product was obtained.

Workup

  1. temperatureat reflux until intermediate
  2. customAfter reaction
  3. custom(18 hrs) it
  4. customwas brought to room temperature
  5. filtrationfiltered
  6. customto obtain product as a yellow powder
  7. washPowder was washed with EtOH
  8. customto dry under vacuum for 1 hr
  9. customreaction
  10. filtrationAfter completion (1 hr), precipitate was filtered
  11. customto obtain D96 as a light yellow powder
  12. washProduct was washed with deionized water
  13. customto remove excess sodium borohydride
  14. customto dry under vacuum for 18 hrs

Sources & evidence

ORD record
ord-8190ba5e787e45e998adce521a068db1
Source dataset
uspto-grants-2016_05
Patent number
US09346792B2

Reaction notes

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