Short and Efficient Syntheses of Protoberberine Alkaloids using Palladium-Catalyzed Enolate Arylation
作者:Alice E. Gatland、Ben S. Pilgrim、Panayiotis A. Procopiou、Timothy J. Donohoe
DOI:10.1002/anie.201409164
日期:2014.12.22
A concise synthesis of the biologically active alkaloid berberine is reported, and a versatile palladium‐catalyzed enolate arylation is used to form the isoquinoline core. The overall yield of 50 % is a large improvement over the single, previous synthesis. By design, this modular route allows the rapid synthesis of other members of the protoberberine family (e.g., pseudocoptisine and palmatine) by
据报道,具有生物活性的生物碱小ber碱的合成简明,并使用一种多功能的钯催化烯醇芳基化反应形成异喹啉核心。50%的总收率比以前的单一合成有很大的提高。通过设计,该模块化途径允许通过替换容易获得的芳基溴化物和酮偶联伙伴来快速合成原小ber碱家族的其他成员(例如,伪铜红碱和棕榈碱)。此外,通过烯醇化芳基化与原位官能化的结合,可以将取代基快速和区域选择性地引入生物碱C13位置,如脱氢钴酸碱的全合成所示。