Dimethylformamide → Methyl[3-(3-methyl-1,2,4-triazolo[4,3-b]pyridazin-6-yl)phenyl]carbamic acid, ethyl ester

HRID 35638Notes

Reaction equation

HRID 35638 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:22])[O:19][CH2:20][CH3:21])[CH:14]=[CH:15][CH:16]=3)[CH:9]=[CH:10][C:5]2=[N:4][N:3]=1.[H-].[Na+].[CH3:25]N(C)C=O.CI>O>[CH3:25][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:22])[O:19][CH2:20][CH3:21]

Participants

6

Reactant 4

HCID 6228DimethylformamideHCID 6328Methyl iodideHCID 24758Sodium hydrideHCID 15595679[3-(3-Methyl-1,2,4-triazolo[4,3-b]-pyridazin-6-yl)phenyl]carbamic acid, ethyl ester

Product 1

HCID 15595680Methyl[3-(3-methyl-1,2,4-triazolo[4,3-b]pyridazin-6-yl)phenyl]carbamic acid, ethyl ester

Reagents, catalysts & solvents 1

HCID 962WaterSolvent

Procedure

A mixture of 1.5 g of [3-(3-methyl-1,2,4-triazolo[4,3-b]-pyridazin-6-yl)phenyl]carbamic acid, ethyl ester, 0.29 g of sodium hydride (50% in oil) and 150 ml of dimethylformamide was stirred under argon for 1 hour and then 0.38 ml methyl iodide was added. This mixture was stirred overnight then poured onto 500 ml of water and extracted with 150 ml portions of dichloromethane. The extracts were combined, dried and concentrated in vacuo. The residue was chromatographed on 300 g of silica gel with dichloromethane-methanol (97:3). The fractions containing product were combined, the solvent evaporated in vacuo and the solid recrystalized from dichloromethane-hexane, to give 1.25 g of an off-white powder, mp 146°-149° C.

Workup

  1. stirringThis mixture was stirred overnight
  2. extractionextracted with 150 ml portions of dichloromethane
  3. customdried
  4. concentrationconcentrated in vacuo
  5. customThe residue was chromatographed on 300 g of silica gel with dichloromethane-methanol (97:3)
  6. additionThe fractions containing product
  7. customthe solvent evaporated in vacuo
  8. customthe solid recrystalized from dichloromethane-hexane

Sources & evidence

ORD record
ord-87a5687d17fd4797ba872dd5dbd04df0
Source dataset
uspto-grants-1988_08
Patent number
US04767765

Reaction notes

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