反应详情

A solution of 786 mg (3.54 mmol) of 4,4-dimethyl-6-carboxythiochroman, 804 mg (3.53 mmol) of benzyl 4-hydroxybenzoate, 800 mg (3.88 mmol) of 1, 3-dicyclohexylcarbodiimide and 60 mg (0.49 mmol) of 4-dimethylaminopyridine in 50 ml of methylene chloride was stirred at room temperature for 2 hours. The reaction mixture was then filtered and the residue washed with 20 ml of methylene chloride. The filtrate was concentrated in-vacuo and the resultant crude product was purified by flash chromatography (silica, 20% ethyl acetate in hexanes) followed by recrystallization from a mixture of hexanes and ethyl acetate to give the title compound as a white, crystalline solid. PMR (CDCl3): δ1.39 (6H, s), 1.98 (2H, m), 3.08 (2H, m), 5.37 (2H, s), 7.20 (1H, d, J~8.3 Hz), 7.28 (2H, d, J~8.0 Hz), 7.34-7.48 (5H, m), 7.82 (1H, dd, J~8.3, 2.0 Hz), 8.14 (2H, d, J~8.0 Hz),

1. filtrationThe reaction mixture was then filtered
2. washthe residue washed with 20 ml of methylene chloride
3. concentrationThe filtrate was concentrated in-vacuo
4. customthe resultant crude product was purified by flash chromatography (silica, 20% ethyl acetate in hexanes)
5. customfollowed by recrystallization from a mixture of hexanes and ethyl acetate