Tetrahydrofuran → HCID 23598853, compound

Participants

Reaction Steps

To a suspension of 4,5-difluoro-6-(-4-iodo-2-methyl-phenylamino)-N-methyl-isophthalamic acid (0.13 g, 0.29 mmol) in N,N-dimethylformamide (5 mL) is added trifluoroacetic acid pentafluorophenyl ester (0.055 mL, 0.32 mmol) and pyridine (0.03 mL, 0.32 mmol). After stirring for 17 hours the reaction mixture is diluted with ethyl acetate and transferred to a separatory funnel, washed twice with 1.0 M HCl, twice with 5% aqueous NaHCO3 solution, 2 times with water and once with saturated brine solution. The organic layers were collected and dried over Na2SO4, filtered and concentrated in vacuo affording 4,5-difluoro-6-(4-iodo-2-methyl-phenylamino)-N-methyl-isophthalamic acid pentafluorophenyl ester (0.08g, 45.2%). To a suspension of 4,5-difluoro-6-(-4-iodo-2-methyl-phenylamino)-N-methyl-isophthalamic acid pentafluorophenyl ester (0.08 g, 0.13 mmol) in freshly distilled THF (3 mL) is added cyclopropylmethylamine hydrochloride (0.016 g, 0.13 mmol), and N,N-diisopropylethylamine (0.07 mL, 0.39 mmol). After stirring at room temperature for 17 hours the reaction mixture was partitioned between ethyl acetate and 1.0 M HCl solution. The organic layer was washed twice with water, twice with saturated brine solution, dried over MgSO4, filtered and concentrated in vacuo. Purification was performed by silica column chromatography in 2:1 ethyl acetate:hexanes affording N1-cyclopropylmethoxy-4,5-difluoro-6-(4-iodo-2-methyl-phenylamino)-N3-methyl-isophthalamide (0.033, 42.8%); mp 198–202° C.; 1H NMR (400 MHz; DMSO-d6) 8.59 (s, 1H), 8.01 (s, 1H), 7.44 (d, 1H, J=5.2), 7.32 (s, 1H), 7.18 (d, 1H, J=7.6), 6.36 (m,1H), 3.34 (d, 2H, J=6.8), 2.56 (d, 3H, J=4.0), 1.99 (s, 3H), 0.82 (m, 1H), 0.27 (d, 2H, J=8.4), 0.00 (m, 2H); MS(APCI)m+1=516;

Provenance & Evidence