Asymmetric hydrolysis of 2, 2-bis (acetoxymethyl) cyclopentanone (5) using biocatalysts and its application to a formal synthesis of (-)-malyngolide are described.For the asymmetric induction at the quaternary carbon of 5, cholinesterase from electric eel was found to be effective to afford the (+)-monoacetate (6)(90%ee).Compound (+)-6 was easily converted to the synthetic intermediate (28) for (-)-malyngolide.
介绍了利用
生物催化剂对 2,2-双(乙酰氧甲基)
环戊酮(5)进行不对称
水解,并将其应用于 (-)-malyngolide 的正式合成。在 5 的季碳上进行不对称诱导时,发现来自电鳗的
胆碱酯酶能有效地生成 (+)- 单
乙酸酯 (6)(90%ee)。