反应详情

温度

-78 °C

To a solution of 1-bromo-3,5-bis(propan-2-yloxy)benzene (46) (2.0 g, 7.3 mmol) in THF (100 mL), cooled to −78° C., a 1.6 M n-BuLi solution in hexanes (9.16 mL, 14.7 mmol) was added dropwise. The temperature was maintained at −78° C. for 30 min, after which a solution of iodine (3.17 g, 29.3 mmol) in THF (15 mL) was added dropwise. The mixture was warmed to −35° C. and maintained at this temperature for 1.5 h. The reaction mixture was diluted with EtOAc (100 mL) and washed with water (2×50 mL) and brine (50 mL). The organic layer was separated, dried (Na2SO4) and concentrated. Purification by column chromatography on silica gel (Hexanes/EtOAc, 4:1) gave 1-iodo-3,5-bis(propan-2-yloxy)benzene (47) (1.85 g, 79%) as a viscous orange oil.

1. temperatureThe mixture was warmed to −35° C.
2. temperaturemaintained at this temperature for 1.5 h
3. washwashed with water (2×50 mL) and brine (50 mL)
4. customThe organic layer was separated
5. dry with materialdried (Na2SO4)
6. concentrationconcentrated
7. customPurification by column chromatography on silica gel (Hexanes/EtOAc, 4:1)