反应详情

温度

52.5 °C

To a stirred solution of 49 (200 mg, 0.39 mmol, scheme 15) and DIPEA (202 μl, 1.16 mmol) in DMSO (5 ml) at rt under nitrogen was added ethyl 4-bromovalerate (85 μl, 0.58 mmol), and the reaction mixture was heated at 50-55° C. for 1 h, then at rt. The reaction mixture was diluted with AcOEt, and successively washed with water, a saturated aqueous solution of sodium bicarbonate and brine, dried over anhydrous magnesium sulfate, filtered and concentrated. The residue was purified twice by Biotage (SiliaFlash 25 g cartridge: 2% of ammonium hydroxide in MeOH/DCM: 1/99 to 10/90 over 20 CV, then 10/90 to 15/85 over 10 CV; Snap 25 g cartridge: 2% of ammonium hydroxide in MeOH/DCM: 1/99 to 15/85 over 30 CV) to afford the desired product 517 (94 mg, 0.145 mmol, 37% yield) as a colorless sticky solid. MS (m/z): 647.75 (M+H).

1. customat rt
2. washsuccessively washed with water
3. dry with materiala saturated aqueous solution of sodium bicarbonate and brine, dried over anhydrous magnesium sulfate
4. filtrationfiltered
5. concentrationconcentrated
6. customThe residue was purified twice by Biotage (SiliaFlash 25 g cartridge