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0 °C

A solution of 4-methoxybenzoyl chloride (1.03 g, 6.02 mmol) in CH3CN (6 ml) was added drop wise to a solution of methyl 3,4-diaminobenzoate (106) (1.00 g, 6.02 mmol) and pyridine (0.49 ml, 6.02 mmol) in CH3CN (25 ml) at 0° C. The reaction mixture was stirred for 3 h at 0° C. and the solvent was evaporated. Ethyl acetate was added and the organic layer was washed successively with saturated solutions of NH4Cl, NaHCO3 and NaCl, dried over MgSO4, filtered and concentrated. After purification by flash chromatography on silica gel (eluent 1-3% MeOH in DCM), 1.03 g (56%) of compound 107 was obtained as a off white solid. 1H NMR: (DMSO) δ(ppm): 9.51 (s, 1H), 7.96 (d, J=8.8 Hz, 2H), 7.75 (d, J=2.0 Hz, 1H), 7.56 (dd, J=8.4, 2.0 Hz, 1H), 7.03 (d, J=9.0 Hz, 2H), 6.75 (d, J=8.4 Hz, 1H), 5.80 (s, 2H), 3.83 (s, 3H), 3.75 (s, 3H). MS: (calc.) 300.1; (obt.) 301.1 (MH)+.

1. customthe solvent was evaporated
2. additionEthyl acetate was added
3. washthe organic layer was washed successively with saturated solutions of NH4Cl, NaHCO3 and NaCl
4. dry with materialdried over MgSO4
5. filtrationfiltered
6. concentrationconcentrated
7. customAfter purification by flash chromatography on silica gel (eluent 1-3% MeOH in DCM)