2-Dicyclohexylphosphino-2',6'-dimethoxybiphenyl → 3-{4-[3-({[Tert-butyl(dimethyl)silyl]oxy}methyl)-2-fluorophenyl]piperazin-1-yl}pyridazine

HRID 1021285Notes

Reaction equation

HRID 1021285 reaction equation
[Si:1]([O:8][CH2:9][C:10]1[C:11]([F:22])=[C:12]([N:16]2[CH2:21][CH2:20][NH:19][CH2:18][CH2:17]2)[CH:13]=[CH:14][CH:15]=1)([C:4]([CH3:7])([CH3:6])[CH3:5])([CH3:3])[CH3:2].Cl.Cl[C:25]1[N:26]=[N:27][CH:28]=[CH:29][CH:30]=1.C1(P(C2CCCCC2)C2C=CC=CC=2C2C(OC)=CC=CC=2OC)CCCCC1.CC(C)([O-])C.[Na+]>C1(C)C=CC=CC=1.C1C=CC(/C=C/C(/C=C/C2C=CC=CC=2)=O)=CC=1.C1C=CC(/C=C/C(/C=C/C2C=CC=CC=2)=O)=CC=1.C1C=CC(/C=C/C(/C=C/C2C=CC=CC=2)=O)=CC=1.[Pd].[Pd]>[Si:1]([O:8][CH2:9][C:10]1[C:11]([F:22])=[C:12]([N:16]2[CH2:21][CH2:20][N:19]([C:25]3[N:26]=[N:27][CH:28]=[CH:29][CH:30]=3)[CH2:18][CH2:17]2)[CH:13]=[CH:14][CH:15]=1)([C:4]([CH3:7])([CH3:5])[CH3:6])([CH3:3])[CH3:2]

Participants

7

Reactant 4

HCID 112698722-Dicyclohexylphosphino-2',6'-dimethoxybiphenylHCID 23676156Sodium t-butoxideHCID 457908893-Chloropyridazine hydrochlorideHCID 866862021-[3-({[tert-Butyl(dimethyl)silyl]oxy}methyl)-2-fluorophenyl]piperazine

Product 1

HCID 866862363-{4-[3-({[Tert-butyl(dimethyl)silyl]oxy}methyl)-2-fluorophenyl]piperazin-1-yl}pyridazineYield 65.5%

Reagents, catalysts & solvents 2

HCID 9811564Bis(dibenzylideneacetone)palladiumCatalystHCID 1140TolueneSolvent

Conditions

Temperature
100 °C

Procedure

1-[3-({[tert-Butyl(dimethyl)silyl]oxy}methyl)-2-fluorophenyl]piperazine (400 mg) was suspended in toluene (8 ml), and 3-chloropyridazine hydrochloride (242 mg), Pd2(dba)3(56 mg), dicyclohexyl(2′,6′-dimethoxybiphenyl-2-yl)phosphine (51 mg), and sodium tert-butoxide (308 mg) were added thereto, followed by stirring at 100° C. overnight. The reaction mixture was cooled to room temperature, and filtered by the addition of CHCl3 and Celite, and the filtrate was concentrated. The obtained residue was purified by silica gel column chromatography (EtOAc:hexane=70:30 to 100:0), and then purified by basic silica gel column chromatography (EtOAc/hexane) to obtain 3-{4-[3-({[tert-butyl(dimethyl)silyl]oxy}methyl)-2-fluorophenyl]piperazin-1-yl}pyridazine (325 mg).

Workup

  1. temperatureThe reaction mixture was cooled to room temperature
  2. filtrationfiltered by the addition of CHCl3 and Celite
  3. concentrationthe filtrate was concentrated
  4. customThe obtained residue was purified by silica gel column chromatography (EtOAc:hexane=70:30 to 100:0)
  5. custompurified by basic silica gel column chromatography (EtOAc/hexane)

Sources & evidence

ORD record
ord-f4bddc81790647a2be55ac4b97a76d34
Source dataset
uspto-grants-2014_05
Patent number
US08716470B2

Reaction notes

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