Propanal → N-[7-(2,4-Dichlorophenyl)-2-methylthiopyrazolo[1,5-a]pyridin-3-yl]-N,N-dipropylamine

HRID 1181888Notes

Reaction equation

HRID 1181888 reaction equation
[Cl:1][C:2]1[CH:7]=[C:6]([Cl:8])[CH:5]=[CH:4][C:3]=1[C:9]1[N:14]2[N:15]=[C:16]([S:22][CH3:23])[C:17]([NH:18][CH2:19][CH2:20][CH3:21])=[C:13]2[CH:12]=[CH:11][CH:10]=1.[CH:24](=O)[CH2:25][CH3:26].S(=O)(=O)(O)O.[BH4-].[Na+]>O1CCCC1.C(OCC)C.O>[Cl:1][C:2]1[CH:7]=[C:6]([Cl:8])[CH:5]=[CH:4][C:3]=1[C:9]1[N:14]2[N:15]=[C:16]([S:22][CH3:23])[C:17]([N:18]([CH2:24][CH2:25][CH3:26])[CH2:19][CH2:20][CH3:21])=[C:13]2[CH:12]=[CH:11][CH:10]=1

Participants

8

Reactant 4

HCID 527PropanalHCID 1118Sulfuric AcidHCID 4311764Sodium borohydrideHCID 21984560N-[7-(2,4-Dichlorophenyl)-2-methylthiopyrazolo[1,5-a]pyridin-3-yl]-N-propylamine

Product 1

HCID 21984542N-[7-(2,4-Dichlorophenyl)-2-methylthiopyrazolo[1,5-a]pyridin-3-yl]-N,N-dipropylamine

Reagents, catalysts & solvents 3

HCID 962WaterSolventHCID 3283Diethyl EtherSolventHCID 8028TetrahydrofuranSolvent

Procedure

N-[7-(2,4-dichlorophenyl)-2-methylthiopyrazolo[1,5-a]pyridin-3-yl]-N-propylamine (59 mg) was dissolved in tetrahydrofuran (1 mL), and after adding propionaldehyde (0.035 mL) and 3 M aqueous sulfuric acid (0.16 mL), sodium borohydride (12 mg) was added in five portions while vigorously stirring on ice, and stirring was continued for 30 minutes. Water was added to the reaction mixture, extraction was performed with diethyl ether and the extract was washed with saturated aqueous sodium hydrogencarbonate and brine. After drying over anhydrous magnesium sulfate and filtration, the solvent was concentrated under reduced pressure, the residue was purified by silica gel column chromatography, and the title compound (49 mg) was obtained from the n-hexane:ethyl acetate (100:1) fraction as a yellow oil.

Workup

  1. additionwas added in five portions
  2. stirringstirring
  3. washthe extract was washed with saturated aqueous sodium hydrogencarbonate and brine
  4. dry with materialAfter drying over anhydrous magnesium sulfate and filtration
  5. concentrationthe solvent was concentrated under reduced pressure
  6. customthe residue was purified by silica gel column chromatography

Sources & evidence

ORD record
ord-fef2d0c435bd41dc8c02159d956ae595
Source dataset
uspto-grants-2007_10
Patent number
US07285666B2

Reaction notes

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