反应详情

{8-[4-Methyl-2-(4-trifluoromethyl-phenyl)-thiazol-5-ylmethylsulfanyl]-chroman-5-yloxy}-acetic acid methyl ester dissolved in 5 ml THF and 1 ml water, was treated with lithium hydroxide monohydrate (327 mg, 7.8 mmol); stirring at room temperature for 1 hour. The reaction mixture was then acidified to about pH 3 with 2 N HCl. The reaction was then extracted into ethyl acetate (2×20 ml). The organic extracts were washed with brine, dried over anhydrous sodium sulfate, decanted, and concentrated in vacuo. Recrystalization from chloroform/hexanes afforded the title compound (750 mg, 96%) as a pale yellow solid. IR (thin film) cm−1: 1745; 400 MHz 1H NMR (DMSO-d6) δ 7.98 (d, 2H, J=8.0 Hz), 7.75 (d, 2H, J=8.0 Hz), 6.97 (d, 1H, J=8.5 Hz), 6.27 (d, 1H, J=8.5 Hz), 4.60 (s, 2H), 4.18 (s, 2H), 4.11 (t, 2H, J=4.6 Hz), 2.56 (t, 2H, J=6.6 Hz), 2.15 (s, 3H), 1.83 (m, 2H).; MS m/z 496 (M+1). Anal. Calc'd for C23H20F3N1O4S2 0.3 CHCl3 C, 52.67; H, 3.85; N, 2.64; found: C, 52.49; H, 3.77; N, 2.54.

1. extractionThe reaction was then extracted into ethyl acetate (2×20 ml)
2. washThe organic extracts were washed with brine
3. dry with materialdried over anhydrous sodium sulfate
4. customdecanted
5. concentrationconcentrated in vacuo
6. customRecrystalization from chloroform/hexanes