Total Synthesis of Racemic Benzomalvin E, a Quinazolinone Isolated from <i>Pencilium sp</i>. FN070315 and Exploration to the Direct Synthesis of (<i>E</i>)-Benzomalvin B
作者:Soumya Jyoti Basak、Jyotirmayee Dash
DOI:10.1021/acs.joc.3c02687
日期:2024.3.1
We present the first total synthesis of (±) benzomalvin E, featuring a quinazolino moiety with a 6–6–6–7-fused tetracyclic skeleton containing three nitrogen atoms. The key transformation involves Cu-catalyzed intramolecular C–N arylation of quinazolinone, leading to a sclerotigenin analogue that undergoes nucleophilic addition with benzaldehyde, enabling the synthesis of (±) benzomalvin E in six linear
Benzomalvins, new suhstance P inhibitors from a Penicillium sp.
作者:HAO H. SUN、COLIN J. BARROW、DAVID M. SEDLOCK、AMANDA M. GILLUM、RAYMOND COOPER
DOI:10.7164/antibiotics.47.515
日期:——
In the course of screening microbial broths for neurokinin receptor antagonists, a series of new benzodiazepines, benzomalvins A (1), B (2) and C (3), has been isolated from the culture broth of a fungus identified as a Penicillium sp. Benzomalvin A (1) showed inhibitory activity against substance P with Ki values of 12, 42 and 43 fXM at the guinea pig, rat and human neurokinin NK1 receptors, respectively. Benzomalvins B (2) and C (3) were only weakly active. The structures of these compounds were determined by spectroscopic methods including MS measurements and NMR analysis.