反应详情

To a cooled solution of 3-hydroxy-4-methoxybenzaldehyde 12 (10.0 g, 65.7 mmol) in dry N,N-dimethyl formamide (75 mL) was added diisopropylethylamine (16.99 g, 131.4 mmol). Before the addition of 1.0 M solution of tert-butyldimethylsilyl chloride in tetrahydrofuran (11.89 g or 78.9 mL, 78.85 mmol) the mixture was stirred under nitrogen for 10 min. After complete addition over 30 min, the reaction mixture was left overnight (12-16 h). Reaction completion was checked by TLC (chloroform on silica gel plate). Water was added to the reaction mixture, extracted with dichloromethane and the organic layer was washed with a saturated sodium bicarbonate solution, water and dried. Removal of solvent in vacuo yielded as an oil which was subjected to column chromatography (eluant: chloroform) to afford as an yellow viscous oil 13 (100%). 1H NMR: δ 0.21 (s, 6H, 2×CH3), 1.01 (s, 9H, 3×CH3), 3.91 (s, 3H, OCH3), 6.94 (d, 1H, J=8.5 Hz, 5H), 7.36 (d, 1H, J=2 Hz, 2H), 7.47 (dd, 1H, J=8.5, 2 Hz, 6H), 9.89 (s, 1H, CHO). Anal. Calcd for C14H22O3Si: C, 63.12, H, 8.32. Found: C, 63.09, H, 8.30.

1. additionAfter complete addition over 30 min
2. waitthe reaction mixture was left overnight (12-16 h)
3. customReaction completion
4. extractionextracted with dichloromethane
5. washthe organic layer was washed with a saturated sodium bicarbonate solution, water
6. customdried
7. customRemoval of solvent in vacuo
8. customyielded as an oil which