反应详情

[4-Cyano-5-fluoro-2-(3-nitro-benzylcarbamoyl)-phenoxy]-acetic acid was prepared in an analogous manner to that set forth in Example 45 (Steps 8-9) except that in Step 8, 5-cyano-4-fluoro-2-hydroxy-N-(3-nitro-benzyl)-benzamide was used in place of N-(4-bromo-2-fluorobenzyl)-4-fluoro-2-hydroxy-5-methyl-benzamide. In Step 9, special care was taken in the hydrolysis of [4-cyano-5-fluoro-2-(3-nitro-benzylcarbamoyl)-phenoxy]-acetic acid ethyl ester. The hydrolysis was performed in dioxane instead of ethanol and quenched after 15 minutes to prevent hydrolysis of the cyano functionality: mp 179-180° C.; Rf 0.22 (20 6 methanol in dichloromethane); 1H NMR (DMSO-d6, 300 MHz) δ 9.12 (t, J=6.0 Hz, 1H), 8.21 (d, J=7.8 Hz, 1H), 8.19 (s, 1H), 8.10 (dd, J1=8.4 Hz, J2=2.6 Hz, 1H), 7.80 (d, J=8.4 Hz, 1H), 7.61 (t, J=8.0 Hz, 1H), 7.45 (d, J=11.4 Hz, 1H), 4.99 (s, 2H), 4.61 (d, J=6.0 Hz, 2H); ESI-LC/MS m/z calcd for C17H12FN3O6: 373.1; Found 472.0 (M−1)−. Anal. calcd for C17H12FN3O6: C, 54.70; N, 11.26; H, 3.24. Found C, 54.43; N, 11.07; H, 3.32.

1. customquenched after 15 minutes
2. customhydrolysis of the cyano functionality