Water → N-Ethyl-N-[3-(3-methyl-1,2,4-triazolo[4,3-b]pyridazin-6-yl)phenyl]acetamide

HRID 329610Notes

Reaction equation

HRID 329610 reaction equation
[CH3:1][C:2]1[N:6]2[N:7]=[C:8]([C:11]3[CH:12]=[C:13]([NH:17][C:18](=[O:20])[CH3:19])[CH:14]=[CH:15][CH:16]=3)[CH:9]=[CH:10][C:5]2=[N:4][N:3]=1.[H-].[Na+].[CH2:23](I)[CH3:24].O>CN(C)C=O>[CH2:23]([N:17]([C:13]1[CH:14]=[CH:15][CH:16]=[C:11]([C:8]2[CH:9]=[CH:10][C:5]3[N:6]([C:2]([CH3:1])=[N:3][N:4]=3)[N:7]=2)[CH:12]=1)[C:18](=[O:20])[CH3:19])[CH3:24]

Participants

6

Reactant 4

HCID 962WaterHCID 6340IodoethaneHCID 24758Sodium hydrideHCID 7532415N-(3-(3-methyl-[1,2,4]triazolo[4,3-b]pyridazin-6-yl)phenyl)acetamide

Product 1

HCID 15595648N-Ethyl-N-[3-(3-methyl-1,2,4-triazolo[4,3-b]pyridazin-6-yl)phenyl]acetamide

Reagents, catalysts & solvents 1

HCID 6228DimethylformamideSolvent

Procedure

To 12.5 g of N-[3-(3-methyl-1,2,4-triazolo[4,3-b]pyridazin-6-yl]phenyl]acetamide (U.S. Pat. No. 4,112,095) in 500 ml of dimethylformamide under argon, was added 2.47 g of sodium hydride (50% in oil). The mixture was stirred for one hour, then 4.1 ml of ethyl iodide was added. This mixture was stirred for 2.5 days, then poured into 1.5 liters of water and extracted with 150 ml portions of dichloromethane. The extracts were combined, dried and evaporated in vacuo. The residue was chromatographed on a Waters Prep 500 silica gel column, eluting with dichloromethane:methanol (97:3). Fractions 8-13 were combined, evaporated in vacuo and the solid recrystallized from dichloromethane-hexane, giving 6.54 g of the desired product, mp 180°-185° C.

Workup

  1. stirringThis mixture was stirred for 2.5 days
  2. extractionextracted with 150 ml portions of dichloromethane
  3. customdried
  4. customevaporated in vacuo
  5. customThe residue was chromatographed on a Waters Prep 500 silica gel column
  6. washeluting with dichloromethane:methanol (97:3)
  7. customevaporated in vacuo
  8. customthe solid recrystallized from dichloromethane-hexane

Sources & evidence

ORD record
ord-f7c4f718e0764902a9ffdcd234948e35
Source dataset
uspto-grants-1990_01
Patent number
US04892873

Reaction notes

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