反应详情

5-(2-Hydroxy-1-methylethyl)-4-methyl-2-benzofuran-1(3H)-one (161 mg, 0.781 mmol, 1.0 eq) was dissolved in DCM (6 ml). To above solution was added Dess-MartinPeriodinane (397 mg, 0.937 mmol, 1.2 eq). The reaction was stirred at rt for 2 hr. To the reaction was added DCM (10 Ml), Na2S2O3 (6 mL) and H2O (6 mL). The mixture was stirred at r.t. for 30 minutes and formed two layers. The bottom layer was separated and washed with aqueous NaHCO3, brine and water, dried over Na2SO4, filtered, and concentrated to dryness. The crude product was used to next step without purification. 1H NMR (500 MHz, CDCl3, δ in ppm): 9.70 (1H, s, CHO), 7.79 (1H, d, J=7.8 Hz), 7.28 (1H, d, J=7.8 Hz), 5.28 (2H, s), 3.27 (1H, m), 2.32 (3H, s), 1.50 (3H, d, J=7.2 Hz).

1. stirringThe mixture was stirred at r.t. for 30 minutes
2. customformed two layers
3. customThe bottom layer was separated
4. washwashed with aqueous NaHCO3, brine and water
5. dry with materialdried over Na2SO4
6. filtrationfiltered
7. concentrationconcentrated to dryness
8. customThe crude product was used to next step without purification