作者:Tim Tremmel、Andreas Puzik、André P. Gehring、Franz Bracher
DOI:10.1002/ardp.201600137
日期:2016.9
Based on the chemotype of canthin‐4‐one alkaloids with moderate antimicrobial activity, a collection of variously substituted canthin‐4‐ones and desaza analogs were synthesized. Key steps in the syntheses were regioselective halogenations of (desaza) canthin‐4‐one, followed by Pd‐catalyzed cross‐coupling reactions. The in vitro screening for antimicrobial activity revealed that two 5‐substituted canthin‐4‐ones
Synthesis of Canthin-4-ones and Isocanthin-4-ones via B Ring Construction
作者:Maria Koyioni、Andreas Kourtellaris、Panayiotis A. Koutentis
DOI:10.1021/acs.joc.4c00440
日期:2024.5.3
intermediate, 8-(2-chlorophenyl)-1,5-naphthyridin-4(1H)-one, for which intramolecular C–N coupling completes the synthesis of the canthin-4-one skeleton. Ten canthin-4-one analogues were prepared in addition to the parent compound. With minor modifications, the synthesis also applies to the synthesis of two series of isocanthin-4-ones.
Canthin-4-one 以市售 3-氨基-4-溴吡啶为原料,通过六步程序合成,总产率为 26%。 3-氨基-4-溴吡啶首先转化为8-溴-1,5-萘啶-4(1 H )-酮。 O-甲基化、分子间 Pd 催化的 C-C 偶联和去甲基化得到关键中间体 8-(2-氯苯基)-1,5-萘啶-4(1 H )-one,从而完成分子内 C-N 偶联Canthin-4-one 骨架的合成。除了母体化合物之外,还制备了十种canthin-4-one类似物。经过较小的修改,该合成也适用于两个系列的异棘黄素-4-酮的合成。