反应详情

温度

-10 °C

Sodium hexamethyldisilazide (1.0 M in tetrahydrofuran, 3.27 mL, 3.27 mmol, 2.3 eq) is added dropwise at −78° C. to a stirred solution of [2-(3-chloro-6-methoxy-quinolin-4-yl)-ethyl]-triphenyl-phosphonium bromide (800 g, 1.42 mmol, 1.0 eq) in tetrahydrofuran (25 mL). The reaction mixture is then stirred for 45 minutes at −10° C. before lowering down the temperature to −78° C. followed by the addition of (trans-4-formyl-cyclohexyl)-carbamic acid tert-butyl ester (420 mg, 1.85 mmol, 1.3 eq). The reaction mixture is then stirred at 0° C. for 1 hour, extracted with ethyl acetate (3×30 mL) and a saturated ammonium chloride aqueous solution (30 mL). The combined organic layers are washed with brine, dried over sodium sulfate, filtered and concentrated to give a crude product that is purified by column chromatography (silica gel, eluent: petroleum ether:ethyl acetate, 8:1, v/v) to afford {trans-4-[3-(3-chloro-6-methoxy-quinolin-4-yl)-propenyl]-cyclohexyl}-carbamic acid tert-butyl ester as an off-white solid (374 mg, 61% yield).

1. custombefore lowering down the temperature to −78° C.
2. stirringThe reaction mixture is then stirred at 0° C. for 1 hour
3. extractionextracted with ethyl acetate (3×30 mL)
4. washThe combined organic layers are washed with brine
5. dry with materialdried over sodium sulfate
6. filtrationfiltered
7. concentrationconcentrated
8. customto give a crude product that
9. customis purified by column chromatography (silica gel, eluent