Concise Synthesis of Spirocyclic, Bridged γ-Butyrolactones via Stereospecific, Dyotropic Rearrangements of β-Lactones Involving 1,2-Acyl and δ-Lactone Migrations
作者:Vikram C. Purohit、Andrea S. Matla、Daniel Romo
DOI:10.1021/ja803579z
日期:2008.8.13
Dyotropic processes involving unprecedented 1,2-acyl migrations provide access to novel spirocyclic, bridged keto-gamma-lactones from a series of fused, tricyclic-beta-lactones, available via biscyclization of ketoacids including a new asymmetric variant. In addition, a spirocyclic bis-gamma-lactone was generated via a dyotropic process involving a 1,2-beta-lactone/sigma-lactone interchange. Overall
涉及前所未有的 1,2-酰基迁移的 Dyotropic 过程提供了从一系列稠合的三环-β-内酯中获得新型螺环、桥连酮-γ-内酯的途径,可通过酮酸的双环化获得,包括一种新的不对称变体。此外,螺环双-γ-内酯是通过涉及 1,2-β-内酯/sigma-内酯交换的dyotropic 过程生成的。总体而言,该序列提供了一种简单的两步法,用于将二酮酸转化为复杂的螺 [5.n] 烷烃,其带有连续的叔碳中心、季碳中心和桥接γ-内酯形式的叔醇.