Scalable Total Syntheses of Some Natural and Unnatural Lamellarins: Application of a One-Pot Domino Process for Regioselective Access to the Central 1,2,4-Trisubstituted Pyrrole Core
作者:Virendra Kumar、Annapurna Awasthi、Abdus Salam、Tabrez Khan
DOI:10.1021/acs.joc.9b01521
日期:2019.9.20
Short and scalable total syntheses of lamellarin G trimethyl ether, lamellarin D trimethyl ether, lamellarin H, lamellarin η, dihydrolamellarin η, and lamellarin U have been realized in four to six linear steps with an overall yield of ≤22%. Highlights of the synthesis include single-step access to the central 1,2,4-trisubstituted pyrrole core in a highly regioselective manner via a one-pot [3+2]
lamellarin G三甲基醚,lamellarin D三甲基醚,lamellarin H,lamellarinη,二氢lamellarinη和lamellarin U的短而可扩展的总合成已通过四至六个线性步骤实现,总收率≤22%。合成的重点包括通过基于一锅[3 + 2]环加成/消除/芳香化序列的多米诺法,以高度区域选择性的方式一步一步进入中心1,2,4-三取代的吡咯核心。随后,在单锅操作中,钯介导的双CH氧化双偶联提供了层状蛋白中存在的五环香豆素融合的吡咯并二氢异喹啉核心的通道。