反应详情

Stannous chloride (3.2 g, 16.98 mmol) was added to a solution of tert-butyl-[4-(4-chloro-2-nitro-phenoxy)-cyclohexyloxy]-dimethyl-silane (1.28 g, 3.32 mmol) in a mixture of ethanol and ethyl acetate (1/1, 40 mL) and the resulting mixture was stirred at room temperature for 24 hours. Ice and an aqueous solution of sodium bicarbonate (5%, 150 mL) were added and the solid formed was filtered, washed with ethyl acetate and discarded. The layers of the filtrate were separated and the aqueous layer was extracted 3 times with ethyl acetate. The combined organic extracts were washed with brine, dried over anhydrous sodium sulfate, filtered through a CELITE™ pad and evaporated under reduced pressure. The yellow oily residue was purified by flash chromatography (EtOAc/hexane, from 5/95 to 80/20) to give 0.5 g (42% yield) of 2-[4-(tert-butyl-dimethyl-silanyloxy)-cyclohexyloxy]-5-chloro-phenylamine as a yellow oil and 803 mg (16% yield) of 4-(2-amino-4-chloro-phenoxy)-cyclohexanol.

1. customthe solid formed
2. filtrationwas filtered
3. washwashed with ethyl acetate
4. customThe layers of the filtrate were separated
5. extractionthe aqueous layer was extracted 3 times with ethyl acetate
6. washThe combined organic extracts were washed with brine
7. dry with materialdried over anhydrous sodium sulfate
8. filtrationfiltered through a CELITE™ pad
9. customevaporated under reduced pressure
10. customThe yellow oily residue was purified by flash chromatography (EtOAc/hexane, from 5/95 to 80/20)