反应详情

温度

90 °C

A mixture of 5-(benzo[b]thiophen-2-yl)-N-methyl-N-(2,2,6,6-tetramethylpiperidin-4-yl)-1,3,4-thiadiazol-2-amine (37 mg, 0.096 mmol) and N-chlorosuccinimide (15.34 mg, 0.115 mmol) in DCE:AcOH (1:1) (1 mL) was heated at 90° C. for six hours. The reaction was cooled to RT, diluted with saturated sodium bicarbonate, extracted with ethyl acetate (3×), and DCM (2×). The combined organic extracts were washed with brine, dried over magnesium sulfate and concentrated to a crystalline yellow solid. Purification by flash column chromatography (4 g silica gel, 1-17% 3.5 N ammonia in MeOH gradient in DCM over 30 column volumes) provided 5-(3-chlorobenzo[b]thiophen-2-yl)-N-methyl-N-(2,2,6,6-tetramethylpiperidin-4-yl)-1,3,4-thiadiazol-2-amine as a yellow solid (18 mg). LC/MS Rt=0.58 min. MS=420.9 (M−1). 1H NMR (400 MHz, METHANOL-d4) δ ppm 7.84-7.99 (m, 2H), 7.47-7.60 (m, 2H), 4.53 (m, 1H), 3.14 (s, 3H), 1.83 (d, J=9.6 Hz, 2H), 1.55-1.68 (m, 2H), 1.38 (s, 6H), 1.26 (s, 6H).

1. temperatureThe reaction was cooled to RT
2. extractionextracted with ethyl acetate (3×), and DCM (2×)
3. washThe combined organic extracts were washed with brine
4. dry with materialdried over magnesium sulfate
5. concentrationconcentrated to a crystalline yellow solid
6. customPurification by flash column chromatography (4 g silica gel, 1-17% 3.5 N ammonia in MeOH gradient in DCM over 30 column volumes)