Acetic Acid → 6-Chloro-2-methyl-4-(5-(1-methylpiperidin-4-yl)pyridin-2-ylamino)pyridazin-3(2H)-one

HRID 449707Notes

Reaction equation

HRID 449707 reaction equation
[Cl:1][C:2]1[CH:3]=[C:4]([NH:10][C:11]2[CH:16]=[CH:15][C:14]([CH:17]3[CH2:22][CH2:21][NH:20][CH2:19][CH2:18]3)=[CH:13][N:12]=2)[C:5](=[O:9])[N:6]([CH3:8])[N:7]=1.C=O.[C:25](O)(=O)C.C(O[BH-](OC(=O)C)OC(=O)C)(=O)C.[Na+].C([O-])(O)=O.[Na+]>O.C1COCC1>[Cl:1][C:2]1[CH:3]=[C:4]([NH:10][C:11]2[N:12]=[CH:13][C:14]([CH:17]3[CH2:22][CH2:21][N:20]([CH3:25])[CH2:19][CH2:18]3)=[CH:15][CH:16]=2)[C:5](=[O:9])[N:6]([CH3:8])[N:7]=1

Participants

8

Reactant 5

HCID 176Acetic AcidHCID 712FormaldehydeHCID 516892Sodium BicarbonateHCID 5049666Sodium triacetoxyborohydrideHCID 667421406-chloro-2-methyl-4-(5-(piperidin-4-yl)pyridin-2-ylamino)pyridazin-3(2H)-one

Product 1

HCID 667423806-Chloro-2-methyl-4-(5-(1-methylpiperidin-4-yl)pyridin-2-ylamino)pyridazin-3(2H)-oneYield 89.6%

Reagents, catalysts & solvents 2

HCID 962WaterSolventHCID 8028TetrahydrofuranSolvent

Conditions

Temperature
0 °C

Procedure

In a 25 mL round-bottomed flask, 6-chloro-2-methyl-4-(5-(piperidin-4-yl)pyridin-2-ylamino)pyridazin-3(2H)-one (620 mg, 1.94 mmol, Eq: 1.00) and formaldehyde (1.57 g, 1.44 ml, 19.4 mmol, Eq: 10) were combined with THF to give a light yellow solution. Acetic acid (116 mg, 111 μl, 1.94 mmol, Eq: 1.00) was added. The reaction mixture was cooled to 0° C. Sodium triacetoxyborohydride (616 mg, 2.91 mmol, Eq: 1.5) was added. The reaction mixture was stirred at room temperature 2 hr. LC/MS showed reaction was complete. The reaction mixture was poured into water. Saturated NaHCO3 was added to make it basic and the resultant mixture was extracted with EtOAc. The combined extracts were washed with water, dried over Na2SO4 and concentrated in vacuo. The resultant solid was triturated with ether to afford the desired product as an off-white solid (580 mg). (M+H)+=334 m/e. This was combined with previous batches to give 1.06 g 6-chloro-2-methyl-4-(1′-methyl-1′,2′,3′,4′,5′,6′-hexahydro-[3,4]bipyridinyl-6-ylamino)-2H-pyridazin-3-one, which was carried on as is into the next reaction.

Workup

  1. customto give a light yellow solution
  2. customreaction
  3. extractionthe resultant mixture was extracted with EtOAc
  4. washThe combined extracts were washed with water
  5. dry with materialdried over Na2SO4
  6. concentrationconcentrated in vacuo
  7. customThe resultant solid was triturated with ether

Sources & evidence

ORD record
ord-003fffb4533f43f681d3cbe7ad38f775
Source dataset
uspto-grants-2013_07
Patent number
US08481540B2

Reaction notes

Loading…