tert-butyl 2-(3-fluoro-5-methoxyphenyl)-4-((3-chloro-4-fluoro-N-methylphenylsulfonamido)methyl)phenoxyacetate → 2-(3-fluoro-5-methoxyphenyl)-4-((3-chloro-4-fluoro-N-methylphenylsulfonamido)methyl)phenoxyacetic acid

Participants

Reaction Steps

To a solution of TFA/DCM (1:3, 80 mL) was added tert-butyl 2-(3-fluoro-5-methoxyphenyl)-4-((3-chloro-4-fluoro-N-methylphenylsulfonamido)methyl)phenoxyacetate (11) (15 g, 26 mol) and the mixture was stirred at room temperature for 2 h. The solvent was evaporated and the resulting solid was rinsed by petroleum ether/EtOAc (10:1 mixture) to yield 2-(3-fluoro-5-methoxyphenyl)-4-((3-chloro-4-fluoro-N-methylphenylsulfonamido)methyl)phenoxyacetic acid (Example 37) (9 g, 67%). 1HNMR (CD3CN, 300 MHz): δ 7.93 (d, 1H), 7.78 (m, 1H), 7.45 (t, 1H), 7.20 (m, 2H), 6.95 (m, 3H), 6.67 (d, 1H), 4.65 (s, 2H), 4.15 (s, 2H), 3.81 (s, 3H), 2.61 (s, 3H). MS (ES-API): MH−=510.0. HPLC (Method A) tR=2.28 min.

Provenance & Evidence