Unprecedented Direct Asymmetric Total Syntheses of 5,8’‐Naphthylisoquinoline Alkaloids from their Fully Substituted Precursors Employing a Novel Nickel/N,N‐ligand‐Catalyzed Atroposelective Cross‐Coupling Reaction
作者:Dino Berthold、Willem A. L. van Otterlo
DOI:10.1002/chem.202302070
日期:2023.11.2
Four different 5,8’-coupled naphthylisoquinoline alkaloids have been prepared via a general and concise synthetic pathway directly from the corresponding cross-coupling reaction precursors. For the cross-coupling key step, a new Negishi cross-coupling reaction, employing a Ni/N,N-ligand-based catalyst providing the natural products in good yields and high enantiomeric purities, has been developed.
四种不同的 5,8'-偶联萘基异喹啉生物碱已通过通用且简洁的合成途径直接从相应的交叉偶联反应前体制备。对于交叉偶联的关键步骤,开发了一种新的根岸交叉偶联反应,采用基于 Ni/N,N-配体的催化剂,以良好的收率和高对映体纯度提供天然产物。此外,我们还报告了一种在萘基异喹啉天然产物中发现的北部 1,8-二氧基萘结构单元的新方法,利用 Hartwig 的硼化/甲基化策略,可以有效安装正交保护基团。