反应详情

A solution of 3-hydroxy-5-(3-amino-2,4,6-trimethylphenyl)-2-propionylcyclohex-2-en-1-one (2.6 g; 8.6 mmole) and pyridine (0.7 g; 9 mmole) in dichloromethane (100 ml) was treated with acetyl chloride (0.69 g; 9 mmole) at 20° C. with stirring. After 1.5 hours the mixture was poured into water (100 ml) and shaken. The organic layer was separated and dried over anhydrous magnesium sulfate and the solvent was removed under reduced pressure using a rotary evaporator. The product was purified by chromatograpy over silica gel (eluent 1% methanol in dichloromethane) to give 3-hydroxy-5-(3-acetamido-2,4,6-trimethylphenyl)-2-propionylcyclohex-2-en-1-one (1.0 g, 34%) as a pale orange semi-crystalline solid. Proton magnetic resonance spectrum (CDCl3, δ in ppm): 1.20 (3H, t); 2.18 (3H, s); 2.20 (3H, s); 2.27 (3H, s); 2.35 (3H, s); 2.4-4.0 (7H, m); 6.6 (1H, bs); 6.88 (1H, s); 18.20 (1H, s).

1. stirringshaken
2. customThe organic layer was separated
3. dry with materialdried over anhydrous magnesium sulfate
4. customthe solvent was removed under reduced pressure
5. customa rotary evaporator
6. customThe product was purified by chromatograpy over silica gel (eluent 1% methanol in dichloromethane)