decarboxylative aldol reaction between malonic acid half-oxyesters and various carbonyls with carboxylate assistance was developed, affording structurally diverse β-hydroxy esters with good yields and enantioselectivities under mild conditions. Importantly, the broad substrate scope of this methodology enabled rapid accesses to several natural products and their analogues as exemplified by phenylpropanoid, phaitanthrin
Synthesis of 6-Alkynyl-6-hydroxyindoloquinazolinone Scaffolds via Copper-Catalyzed Alkynylation of Tryptanthrins
作者:Yu Guo、Ebrahim-Alkhalil M. A. Ahmed、De-Kun Ma、Jun Jiang、Hongxin Liu、Xinhua Li、Juan Li、Hong-Ping Xiao
DOI:10.1055/a-1533-1080
日期:2021.9
alkynes under mild reaction conditions. The developed method provides an array of synthetic buildingblocks of 6-alkynyl-6-hydroxyindoloquinazolinone compounds in moderate to good yields with varied functional group compatibility. Furthermore, the obtained adducts can be smoothly converted into versatile buildingblocks via hydrogenation, hydration, and further Sonogashira coupling transformations.
The first asymmetricsynthesis of (S)-Phaitanthrin A and its derivatives via a catalytic aldolreaction of Tryptanthrin and ketones is described, in which the cheap, easily prepared natural aminoacid salts exhibited unique catalytic ability; importantly, this methodology tolerates a range of substrates with different substitution patterns. Moreover, the synthetic utility of this strategy was further
Ni(acac)2-Catalyzed Addition Reactions of Aryl- and Alkylboronic Acids to Tryptanthrins
作者:Hong-Ping Xiao、Jun Jiang、Wei-Long Chen、Chong-Xing Liu
DOI:10.1055/s-0035-1562229
日期:——
Ni(acac)2-catalyzed 1,2-addition reaction of tryptanthrins with aryl- or alkylboronic acids gave the corresponding indoloquinazolinone-type quaternary alcohols in 30–90% yield. Importantly, this reaction showed a good tolerance of functional groups and a remarkably broad substrate scope that included substrates bearing halogenatoms.
Targeting topoisomerase II with trypthantrin derivatives: Discovery of 7-((2-(dimethylamino)ethyl)amino)indolo[2,1-b]quinazoline-6,12-dione as an antiproliferative agent and to treat cancer
作者:Elena Catanzaro、Nibal Betari、Jose M. Arencibia、Serena Montanari、Claudia Sissi、Angela De Simone、Ivano Vassura、Alan Santini、Vincenza Andrisano、Vincenzo Tumiatti、Marco De Vivo、Dmitri V. Krysko、Marco B.L. Rocchi、Carmela Fimognari、Andrea Milelli
DOI:10.1016/j.ejmech.2020.112504
日期:2020.9
appearance of resistance mechanisms upon treatment with topoII-targeted anticancer drugs. In the present investigation, we report the discovery of a new topoII inhibitor, whose design was based on the structure of the natural product trypthantrin, a natural alkaloidal compound containing a basic indoloquinazoline moiety. This new topoII inhibitor, here numbered compound 5, is found to inhibit topoII with