Visible-Light-Promoted Biomimetic Reductive Functionalization of Quaternary Benzophenanthridine Alkaloids
作者:Lin Wang、Xinhao Wang、Wei Wang、Wei Liu、Yisong Liu、Hongqi Xie、Oliver Reiser、Jianguo Zeng、Pi Cheng
DOI:10.1021/acs.jnatprod.1c00512
日期:2021.8.27
Reduction of an iminium C═N double bond is the most important phase I metabolism process associated with the cytotoxic property of quaternary benzophenanthridine alkaloids (QBAs). Inspired by the light-mediated reduction of QBAs with nicotinamide adenine dinucleotide, a visible-light-promoted reductive functionalization reaction of QBAs is reported in this study. C4-Alkyl-1,4-dihydropyridines (DHPs)
亚胺鎓 C=N 双键的还原是与季苯并菲啶生物碱 (QBA) 的细胞毒性相关的最重要的 I 相代谢过程。受光介导的烟酰胺腺嘌呤二核苷酸还原 QBA 的启发,本研究报道了可见光促进的 QBA 还原功能化反应。C4-烷基-1,4-二氢吡啶 (DHP) 能够独立地对 QBA 进行直接还原烷基化,在没有光催化剂和其他添加剂的情况下,在 455 nm 蓝光照射下用作单电子转移还原剂。我们的协议可以进一步应用于天然 6-取代二氢苯并菲啶衍生物的半合成, 如O-乙酰基麦克卡品 E。