反应详情

温度

0 °C

3-Bromo-5-(pyridin-3-ylamino)-phenol (11.62 g, 43.83 mmol) was dissolved in DMF (115 mL) under dry argon and cooled to 0° C. Then 60% NaH (1.93 g, 48.21 mmol) was added in small portions over a period of 45 min. Stirring was continued for 15 min, followed by drop wise addition of TBDPS-chloride (11.2 mL, 43.83 mmol). The mixture was warmed to room temperature and stirred for 20 h. The reaction mixture was diluted with tert-butylmethyl ether (200 mL) and washed with water and brine (2×50 mL each). The organic layer was dried (MgSO4) and concentrated to give the crude product which was purified by flash chromatography on silica gel (600 g, AcOEt/heptane 1:2→1:1). [3-Bromo-5-(tert-butyl-diphenyl-silanyloxy)-phenyl]-pyridin-3-yl-amine (21.2 g, 96%) was obtained as a yellow resin.

1. temperatureThe mixture was warmed to room temperature
2. stirringstirred for 20 h
3. washwashed with water and brine (2×50 mL each)
4. dry with materialThe organic layer was dried (MgSO4)
5. concentrationconcentrated
6. customto give the crude product which
7. customwas purified by flash chromatography on silica gel (600 g, AcOEt/heptane 1:2→1:1)