反应详情

A solution of 2,6-dimethyl-5-(4,5,7-trifluorobenzothiazole-2-yl-methyl)-pyridin-3-yl-acetonitrile (0.50 g, 1.43 mmol) in 50% hydrochloric acid (HCl) (8 ml, 0.2 M) under nitrogen is warmed (90° C. bath) and stirred overnight. The reaction mixture is added to H2O (20 mL) and brought to pH 5 with NaHCO3. The solids are filtered and the aqueous extracted with ethyl acetate (5×30 mL). The solid and extracts are combined and purified by reverse-phase HPLC (acetonitrile/water, 0.05% HCl)to give 2,6-Dimethyl-5-(4,5,7-trifluoro-benzothiazole-2-ylmethyl)-pyridin-3-yl-acetic acid as a white solid (0.40 g, 75%): mp 211° C. dec 1H NMR (DMSO-d6, 300 MHz) δ 8.29 (s, 1 H), 7.85-7.74 (m, 1 H), 4.80 (s, 2 H), 3.86 (s, 2 H), 2.73 (s, 3 H), 2.67 (s, 3 H), ESI-LCMS m/z calcd for C17H13F3N2O2S: 366.1; found 367.0 (M+1)+. Anal. Calcd for C17H14ClF3N2O2S: C, 50.69; H, 3.50; N, 6.95; Cl, 8.80; S; 7.96. Found: C, 50.48; H, 3.63; N, 6.89; Cl, 8.97; S, 7.84.

1. filtrationThe solids are filtered
2. extractionthe aqueous extracted with ethyl acetate (5×30 mL)
3. custompurified by reverse-phase HPLC (acetonitrile/water, 0.05% HCl)