反应详情

2-[3-(2-Chloro-phenyl)-3,4-dihydro-2H-1,4-benzothiazin-7-yl]-1,1,1,3,3,3-hexafluoro-propan-2-ol: To 2-amino-benzenethiol (1.07 mL, 10 mmol) in DMF (10 mL) under an argon atmosphere was added o-bromo-2-chloro-acetophenone (1.5 mL, 9.8 mmol) at 0° C. and the reaction was warmed to rt. After 10 min, NaBH3CN (1.5 g, 71 mmol) was added portion-wise over 5 min and the reaction was stirred for 16 h. The reaction was quenched with 1N HCl, then neutralized to pH 8 with conc. NaHCO3. The product was extracted with ether, washed with water, dried over MgSO4, and concentrated. The resulting residue was purified by flash chromatography to give 3-(2-chloro-phenyl)-3,4-dihydro-2H-1,4-benzothiazine (1.7 g). A mixture of this intermediate (420 mg, 1.6 mmol) and hexafluoroacetone: 1.5 H2O (620 mg, 3.2 mmol) in DCM (1 mL) was heated in a sealed tube in a microwave reactor at 160° C. for 80 min. The resulting mixture was purified by flash chromatography to give 200A (260 mg). LC/MS m/z 427.87 (M+H)+. 1H NMR (400 MHz, CDCl3) δ ppm 3.03-3.15 (m, 2H) 5.26 (m, 1H) 6.58 (d, J=8, 1H) 7.24-7.28 (m, 2H) 7.37-7.43 (m, 2H).

1. customThe reaction was quenched with 1N HCl
2. extractionThe product was extracted with ether
3. washwashed with water
4. dry with materialdried over MgSO4
5. concentrationconcentrated
6. customThe resulting residue was purified by flash chromatography