反应详情

A solution of 7-({2-[(4-methoxybenzyl)amino]pyridin-4-yl}oxy)-1,2,3,4-tetrahydronaphthalene-2-carboxylic acid (21.5 g, 0.0532 mol), anisole (52 mL, 0.48 mol) and TFAA (100 mL, 2 mol) in DCM (400 mL) was stirred at 37° C. overnight. The solvent was removed by evaporation at 30° C. To the resulting mixture was added 1N NaOH (300 mL) and the solution was extracted with ether. The aqueous solution was acidified with conc. HCl to pH=3. The water layer was discarded, the residue was washed with water (3×). The solid was dried in vacuo overnight to give 7-[(2-aminopyridin-4-yl)oxy]-1,2,3,4-tetrahydronaphthalene-2-carboxylic acid (14.3 g). The combined yield for steps 2 and 3 was 94%. 1H NMR (DMSO-d6, 400 MHz) 7.83 (d, 1H); 7.30 (s, 2H); 7.20 (d, 1H); 6.98 d, 1H); 6.95 (dd, 1H); 6.46 (dd, 1H); 5.95 (d, 1H); 3.70 (s, 2H); 2.60-3.00 (m, 5H); 2.09 (m, 1H); 1.72 (m, 1H). LCMS ES+ 285.3.

1. customThe solvent was removed by evaporation at 30° C
2. additionTo the resulting mixture was added 1N NaOH (300 mL)
3. extractionthe solution was extracted with ether
4. washthe residue was washed with water (3×)
5. customThe solid was dried in vacuo overnight