Synthesis of Ring-Fused, N-Substituted 4-Quinolinones Using p<i>K</i><sub>a</sub>-Guided, Base-Promoted Annulations with Isatoic Anhydrides: Total Synthesis of Penicinotam
作者:Muhammad M. Khalifa、Satish Chandra Philkhana、Jennifer E. Golden
DOI:10.1021/acs.joc.9b02541
日期:2020.1.17
deprotonation susceptibility, such as tetramic and tetronic acids, cyclic 1,3-diketones, and cycloalkanones. Application to the synthesis of bioactive, pyrrolizine-fused 4-quinolinone, penicinotam 3, resulted in the most brief and highest yielding total synthesis of the alkaloid in three steps and a 36% overall yield.
开发了一种使用等位酸酐和多种可烯化伙伴的阴离子环化策略,以提供80多种新型的环稠合N取代的4-喹啉酮,这是一种代表性不足的特权模板。确定了控制转化效率的多种因素,从而形成了可靠且可调谐的合成平台,适用于具有多种去质子化敏感性的多种底物,例如四甲酸和四氢代酸,环状1,3-二酮和环烷酮。应用于生物活性的吡咯烷嗪融合的4-喹啉酮青霉素3的合成中,生物碱的合成过程最简单,最高,分三步进行,总产率为36%。