Intramolecular N-aza-amidoalkylation in association with Witkop–Winterfeldt oxidation as the key step to synthesize Luotonin-A analogues
摘要:
An expedient four-step approach for the synthesis of a short library of original analogues of the Topo-I Luotonin-A inhibitor, substituted at their C-8- and N-15-positions, was investigated. This consists of Rutaecarpines formation, their Witkop-Winterfeldt oxidation followed ultimately with functional adjustment of the pyrroloquinolone intermediates. In the first step of these investigations. Rutaecarpines including the Topo-I poison Evodiamine were obtained via the new tandem N-acylation/aza-amidoalkylation using a nitrogen atom as an internal nucleophile with or without association with a decarboxylation. (C) 2011 Elsevier Ltd. All rights reserved.
A concise synthesis and biological study of evodiamine and its analogues
作者:Jie-Dan Deng、Shuai Lei、Yi Jiang、Hong-Hua Zhang、Xiao-Ling Hu、Huai-Xiu Wen、Wen Tan、Zhen Wang
DOI:10.1039/c9cc00434c
日期:——
to evodiamine and itsanalogues is presented via Lewis acid catalysis. In this reaction, three chemical bonds and two heterocyclic-fused rings are constructed in one step. The reaction shows good functional group tolerance and atom economy, and various heteroatom-containing evodiamine analogues are obtained in moderate to excellent yields even on a gram scale. An anti-tumor study in vitro demonstrates
Reported herein is a visible-light-driven intramolecular C-N cross-coupling reaction under mild reaction conditions (metal- and photocatalyst-free, at room temperature) via a long-lived photoactive photoisomer complex. This strategy was used to rapidly prepare the N-substituted polycyclic quinazolinone derivatives with a broad substrate scope (>50 examples) and further exploited to synthesize the natural
has been found to exert various biological activities such as anti-cancer and anti-hepatic fibrosis via blocking topoisomerase, NF-κB, TGF-β/HGF, and Smad2/3. Inspired by these facts, 15 evodiamine derivatives were designed and synthesized for HCC treatment by simultaneously targeting Topo I and CAFs. Most of them displayed preferable anti-HCC activities on three HCC cell lines and low cytotoxicity
This reaction does not use transition metals, has a broad substrate scope, and can be used on a gram scale. Under the optimal reaction conditions, a variety of quinazolinone-fused tetrahydroisoquinolines and derivatives of Rutaecarpine were synthesized from readily accessible compounds. The reaction proceeds well with crude 2-aminobenzamide derivatives, allowing for the synthesis of the products from