Sodium Carbonate → 2-benzyl-4-methoxy-5-p-tolylpyridazin-3(2H)-one

HRID 2224282Notes

Reaction equation

HRID 2224282 reaction equation
[CH2:1]([N:8]1[C:13](=[O:14])[C:12]([O:15][CH3:16])=[C:11](Cl)[CH:10]=[N:9]1)[C:2]1[CH:7]=[CH:6][CH:5]=[CH:4][CH:3]=1.[CH3:18][C:19]1[CH:24]=[CH:23][C:22](B(O)O)=[CH:21][CH:20]=1.C([O-])([O-])=O.[Na+].[Na+]>C1(C)C=CC=CC=1.C1C=CC([P]([Pd]([P](C2C=CC=CC=2)(C2C=CC=CC=2)C2C=CC=CC=2)([P](C2C=CC=CC=2)(C2C=CC=CC=2)C2C=CC=CC=2)[P](C2C=CC=CC=2)(C2C=CC=CC=2)C2C=CC=CC=2)(C2C=CC=CC=2)C2C=CC=CC=2)=CC=1>[CH2:1]([N:8]1[C:13](=[O:14])[C:12]([O:15][CH3:16])=[C:11]([C:22]2[CH:23]=[CH:24][C:19]([CH3:18])=[CH:20][CH:21]=2)[CH:10]=[N:9]1)[C:2]1[CH:7]=[CH:6][CH:5]=[CH:4][CH:3]=1

Participants

6

Reactant 3

HCID 10340Sodium CarbonateHCID 79799Tolylboronic acidHCID 135262132-Benzyl-5-chloro-4-methoxypyridazin-3(2H)-one

Product 1

HCID 597166512-benzyl-4-methoxy-5-p-tolylpyridazin-3(2H)-oneYield 89.4%

Reagents, catalysts & solvents 2

HCID 178418397HCID 178418397, compoundCatalystHCID 1140TolueneSolvent

Conditions

Temperature
100 °C

Procedure

To a solution of 2-benzyl-5-chloro-4-methoxypyridazin-3(2H)-one (20 g, 80 mmol), prepared as described in Example 361B, and 4-methylphenylboronic acid (13 g, 96 mmol) in toluene (300 mL) at RT under argon was added (Ph3P)4Pd (1.85 g, 1.8 mmol) and 2 M aqueous Na2CO3 solution (160 mL, 320 mmol). The resulting suspension was heated at 100° C. for 5 h with stirring. HPLC/MS indicated complete reaction. After cooling the reaction mixture to room temperature, it was extracted with CH2Cl2 (200 mL×2), then dried (Na2SO4), filtered and concentrated under vacuum. The crude product was purified by silica gel column chromatography (ISCO) eluting with hexanes/EtOAc to give the title compound, 2-benzyl-4-methoxy-5-p-tolylpyridazin-3(2H)-one, (21.9 g, 89%) as a white foam. MS [M+H]+ 307; HPLC retention time=3.78 min.

Workup

  1. customreaction
  2. temperatureAfter cooling the reaction mixture to room temperature
  3. extractionit was extracted with CH2Cl2 (200 mL×2)
  4. dry with materialdried (Na2SO4)
  5. filtrationfiltered
  6. concentrationconcentrated under vacuum
  7. customThe crude product was purified by silica gel column chromatography (ISCO)
  8. washeluting with hexanes/EtOAc

Sources & evidence

ORD record
ord-9a0ca23fca4b44cfa229a3c3d5e0c9be
Source dataset
uspto-grants-2008_05
Patent number
US07378418B2

Reaction notes

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