反应详情

n-Butyllithium (2.5 M hexanes 12.4 ml, 30.9 mmol) is added to N,N-diisopropylamine (4.4 ml, 31.4 mmol) in tetrahydrofuran (THF, 50 ml) at 0° C. After 10 minutes, the resultant solution is transferred via cannula to a cooled (−78° C.) solution of methyl 3-phenylbutyrate (5.0 g, 28.05 mmol) in THF (50 ml). After 40 minutes, the resultant solution is transferred via cannula to a solution of acetyl chloride (19.15 ml) in THF (50 ml). The resultant mixture is stirred at −78° C. for 1.5 hours, then warmed to 0° C. after which water is added and the mixture is then poured into saturated NaHCO3 and extracted with EtOAc. The combined organic phases are washed with brine, dried (MgSO4) and evaporated. Purification by flash chromatography (12:1 EtOAc-hexane elution) affords the title compound. δH 1.3 (d J 7 3H), 2.3 (s 3H), 3.4 (s 3H), 3.6 (m 1H), 3.8 (m 1H), 7.2-7.4 (m 5H)

1. waitAfter 40 minutes
2. additionis added
3. extractionextracted with EtOAc
4. washThe combined organic phases are washed with brine
5. dry with materialdried (MgSO4)
6. customevaporated
7. customPurification
8. washby flash chromatography (12:1 EtOAc-hexane elution)