Sodium Carbonate → 4-Bromo-3',5'-dimethoxy-biphenyl-2,3-diamine

HRID 1189796Notes

Reaction equation

HRID 1189796 reaction equation
[CH3:1][O:2][C:3]1[CH:4]=[C:5](B(O)O)[CH:6]=[C:7]([O:9][CH3:10])[CH:8]=1.[Br:14][C:15]1[CH:20]=[CH:19][C:18](Br)=[C:17]([NH2:22])[C:16]=1[NH2:23].C([O-])([O-])=O.[Na+].[Na+]>CCO.C1(C)C=CC=CC=1.CCOC(C)=O.O.C1C=CC(P(C2C=CC=CC=2)[C-]2C=CC=C2)=CC=1.C1C=CC(P(C2C=CC=CC=2)[C-]2C=CC=C2)=CC=1.Cl[Pd]Cl.[Fe+2]>[Br:14][C:15]1[CH:20]=[CH:19][C:18]([C:5]2[CH:4]=[C:3]([O:2][CH3:1])[CH:8]=[C:7]([O:9][CH3:10])[CH:6]=2)=[C:17]([NH2:22])[C:16]=1[NH2:23]

Participants

9

Reactant 3

HCID 10340Sodium CarbonateHCID 4374257(3,5-Dimethoxyphenyl)boronic acidHCID 118215323,6-Dibromobenzene-1,2-diamine

Product 1

HCID 592928784-Bromo-3',5'-dimethoxy-biphenyl-2,3-diamineYield 37.9%

Reagents, catalysts & solvents 5

HCID 178418228Bis(cyclopenta-1,4-dien-1-yl(diphenyl)phosphane);dichloropalladium;iron(2+)CatalystHCID 702EthanolSolventHCID 962WaterSolventHCID 1140TolueneSolventHCID 8857Ethyl AcetateSolvent

Conditions

Temperature
105 °C

Procedure

A mixture of 3,5-dimethoxyphenylboronic acid (15.1 g, 82.7 mmol, 1.1 equiv) (Step 1.8) in EtOH (50 mL) was added dropwise to a mixture of 3,6-dibromo-benzene-1,2-diamine (20 g, 75.2 mmol) (Step 1.6), PdCl2(dppf) (6.1 g, 7.5 mmol, 0.1 equiv), Na2CO3 (2 M solution in H2O, 150 mL, 300.8 mmol, 4 equiv) in toluene (300 mL) at 105° C., under an argon atmosphere. The reaction mixture was stirred at 105° C. for 3 h, allowed to cool to rt, diluted with EtOAc and H2O and extracted with EtOAc. The organic phase was washed with H2O and brine, dried (Na2SO4), filtered and concentrated. The crude product was purified by silica gel column chromatography (DCM) followed by trituration in EtOH to afford 9.2 g of the title compound as a white solid: ES-MS: 323.0/325.0 [M+H]+; tR=4.43 min (System 1); Rf=0.15 (DCM).

Workup

  1. temperatureto cool to rt
  2. extractionextracted with EtOAc
  3. washThe organic phase was washed with H2O and brine
  4. dry with materialdried (Na2SO4)
  5. filtrationfiltered
  6. concentrationconcentrated
  7. customThe crude product was purified by silica gel column chromatography (DCM)

Sources & evidence

ORD record
ord-0b5f61c3c3c543a7b93d118cdebba0a2
Source dataset
uspto-grants-2014_03
Patent number
US08674099B2

Reaction notes

Loading…