Methanol → Methyl 2-(4'-(6-carbamoyl-3,5-dimethylpyrazin-2-yl)-2,2'-difluorobiphenyl-4-yl)acetate

HRID 1930129Notes

Reaction equation

HRID 1930129 reaction equation
FC(F)(F)S(O[C:7]1[CH:12]=[CH:11][C:10]([C:13]2[C:18]([CH3:19])=[N:17][C:16]([CH3:20])=[C:15]([C:21](=[O:23])[NH2:22])[N:14]=2)=[CH:9][C:8]=1[F:24])(=O)=O.[F:27][C:28]1[CH:29]=[C:30]([CH2:43][C:44]([O:46][CH3:47])=[O:45])[CH:31]=[CH:32][C:33]=1B1OC(C)(C)C(C)(C)O1.P([O-])([O-])([O-])=O.[K+].[K+].[K+].CO>COCCOC.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].C(Cl)Cl.O>[C:21]([C:15]1[N:14]=[C:13]([C:10]2[CH:11]=[CH:12][C:7]([C:33]3[CH:32]=[CH:31][C:30]([CH2:43][C:44]([O:46][CH3:47])=[O:45])=[CH:29][C:28]=3[F:27])=[C:8]([F:24])[CH:9]=2)[C:18]([CH3:19])=[N:17][C:16]=1[CH3:20])(=[O:23])[NH2:22]

Participants

8

Reactant 4

HCID 887MethanolHCID 62657Potassium Phosphate, TribasicHCID 59627655HCID 59627655, compound2×HCID 59627674Methyl 2-[3-fluoro-4-(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)phenyl]acetate2×

Product 1

HCID 59627685Methyl 2-(4'-(6-carbamoyl-3,5-dimethylpyrazin-2-yl)-2,2'-difluorobiphenyl-4-yl)acetateYield 76%

Reagents, catalysts & solvents 3

HCID 178418807HCID 178418807, compoundCatalystHCID 962WaterSolventHCID 80711,2-DimethoxyethaneSolvent

Conditions

Temperature
90 °C

Procedure

A solution of 4-(6-carbamoyl-3,5-dimethylpyrazin-2-yl)-2-fluorophenyl trifluoromethanesulfonate (Intermediate 6-4; 302 mg, 0.77 mmol) and methyl 2-(3-fluoro-4-(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)phenyl)acetate (Intermediate 6-2; 226 mg, 0.77 mmol) and potassium phosphate, tri-basic (196 mg, 0.92 mmol) in DME (10 mL), methanol (5 mL) and water (2.5 mL) was thoughroughly degassed. The mixture was treated with PdCl2(dppf)-DCM adduct (31.4 mg, 0.04 mmol), degassed again and the atmosphere replaced with nitrogen before being heated to 90° C. for 4 hours. The reaction mixture was allowed to cool to room temperature and then evaporated. The crude product was partitioned between EtOAc (75 mL), and saturated brine (75 mL). The organic layer was dried over MgSO4, filtered and evaporated to afford crude product. The crude product was purified by flash silica chromatography, elution gradient 0 to 70% EtOAc in isohexane. Pure fractions were evaporated to dryness to afford methyl 2-(4′-(6-carbamoyl-3,5-dimethylpyrazin-2-yl)-2,2′-difluorobiphenyl-4-yl)acetate (240 mg, 76%) as a cream solid.

Workup

  1. customdegassed again
  2. temperatureto cool to room temperature
  3. customevaporated
  4. customThe crude product was partitioned between EtOAc (75 mL), and saturated brine (75 mL)
  5. dry with materialThe organic layer was dried over MgSO4
  6. filtrationfiltered
  7. customevaporated
  8. customto afford crude product
  9. customThe crude product was purified by flash silica chromatography, elution gradient 0 to 70% EtOAc in isohexane
  10. customPure fractions were evaporated to dryness

Sources & evidence

ORD record
ord-35a312b0f80345faa193901673e61f69
Source dataset
uspto-grants-2012_05
Patent number
US08188092B2

Reaction notes

Loading…