Various halogenated α‐exo‐methylene‐γ‐butyrolactones and α‐exo‐methylene‐δ‐valerolactones were obtained in high yields and enantioselectivities. The resulting enantioenriched halogenated α‐exo‐methylene‐lactones were found to exhibit significant tumor‐inhibiting activities.
α-外-亚甲基-γ丁内酯和α-外亚甲基- δ
戊内酯构成的天然和
生物活性产品的重要基团。描述了使用(
DHQD)2 PHAL催化剂对烯二酸的对映选择性卤代内酯化。以高收率和对映选择性获得了各种卤代α-外-亚甲基-
γ-丁内酯和α-外-亚甲基-
δ-戊内酯。发现所得的对映体富集的卤代α-外-亚甲基-内酯具有显着的抑瘤活性。