3,6-Dichloropyridazine → HCID 19095533, compound

HRID 486459Notes

Reaction equation

HRID 486459 reaction equation
[Cl:1][C:2]1[N:3]=[N:4][C:5](Cl)=[CH:6][CH:7]=1.[N:9]1[CH:14]=[CH:13][CH:12]=[CH:11][C:10]=1[N:15]1[CH2:20][CH2:19][NH:18][CH2:17][CH2:16]1.C(=O)([O-])O.[Na+]>C(O)C>[Cl:1][C:2]1[N:3]=[N:4][C:5]([N:18]2[CH2:19][CH2:20][N:15]([C:10]3[CH:11]=[CH:12][CH:13]=[CH:14][N:9]=3)[CH2:16][CH2:17]2)=[CH:6][CH:7]=1

Participants

5

Reactant 3

HCID 673313,6-DichloropyridazineHCID 944591-(2-Pyridyl)piperazineHCID 516892Sodium Bicarbonate

Product 1

HCID 19095533HCID 19095533, compoundYield 45.3%

Reagents, catalysts & solvents 1

HCID 702EthanolSolvent

Procedure

A mixture of 3.3 parts of 3.6-dichloropyridazine, 3.3 parts of 1-(2-pyridinyl)piperazine. 1.5 parts of sodium hydrogencarbonate and 120 parts of ethanol was stirred and refluxed over weekend. The reaction mixture was evaporated. Water was added to the residue and the product was extracted with dichloromethane. The extract was dried, filtered and evaporated. The residue was purified by column chromatography over silica gel using a mixture of trichloromethane and methanol (99:1 by volume) as eluent. The pure fractions were collected and the eluent was evaporated. The residue was crystallized from a mixture of 2-propanol and tetrahydrofuran, yielding 2.5 parts (45.3%) of 3-chloro-6-[4-(2-pyridinyl)-1-piperazinyl]pyridazine; mp. 194.7° C. (compound 213).

Workup

  1. temperaturerefluxed over weekend
  2. customThe reaction mixture was evaporated
  3. additionWater was added to the residue
  4. extractionthe product was extracted with dichloromethane
  5. customThe extract was dried
  6. filtrationfiltered
  7. customevaporated
  8. customThe residue was purified by column chromatography over silica gel using
  9. additiona mixture of trichloromethane and methanol (99:1 by volume) as eluent
  10. customThe pure fractions were collected
  11. customthe eluent was evaporated
  12. customThe residue was crystallized from a mixture of 2-propanol and tetrahydrofuran

Sources & evidence

ORD record
ord-bf36a5459c3043c7811befb0211ebefb
Source dataset
uspto-grants-1994_03
Patent number
US05292738

Reaction notes

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