[CH3:1][O:2][C:3]([C:5]1[C:10]([NH2:11])=[N:9][CH:8]=[C:7](Br)[N:6]=1)=[O:4].[CH3:13]OC1C=CC=C(OC)C=1C1C=CC=CC=1P(C1CCCCC1)C1CCCCC1.CB(O)O.P([O-])([O-])([O-])=O.[K+].[K+].[K+]>O.Cl.C([O-])(=O)C.[Pd+2].C([O-])(=O)C.C1(C)C=CC=CC=1>[CH3:1][O:2][C:3]([C:5]1[C:10]([NH2:11])=[N:9][CH:8]=[C:7]([CH3:13])[N:6]=1)=[O:4]
3-Amino-6-bromopyrazine-2-carboxylic acid methyl ester (1.0 g), palladium acetate (0.101 g), and S-Phos (2′-dicyclohexylphosphino-2,6-dimethoxy-1,1′-biphenyl) were placed in a flask, with toluene (15 mL) and water (3 drops). Methyl boronic acid (0.394 g) and potassium phosphate (1.71 g) were added and the reaction mixture was refluxed for 24 hours. After allowing the reaction mixture to cool, the mixture was diluted with aqueous hydrochloric acid (1M) and extracted with ethyl acetate. The solvent was evaporated and the residue was purified by column chromatography on silica gel (eluent: diethyl ether) to give 3-amino-6-methylpyrazine-2-carboxylic acid methyl ester as a yellow solid (0.114 g).
Wird geladen…
