Synthesis of polyhydroxylated xanthones via acyl radical cyclizations
摘要:
2-Formylphenoxy quinones can be converted into xanthones via an acyl radical intermediate with NBS and AIBN. (C) 2011 Elsevier Ltd. All rights reserved.
Construction of Highly Functionalized Xanthones via Rh-Catalyzed Cascade C–H Activation/<i>O</i>-Annulation
作者:Sagar D. Nale、Debabrata Maiti、Yong Rok Lee
DOI:10.1021/acs.orglett.1c00391
日期:2021.4.2
facile and efficient strategy for obtaining functionalized and multihydroxylated xanthones via Rh catalysis under redox-neutral conditions is developed. Diverse salicylaldehydes bearing heterocycles, aromatics, and fused aromatics can be rapidly coupled with 1,4-benzoquinones or 1,4-hydroquinones to afford valuable xanthones via cascade C–H/O–H functionalization and annulation. This protocol provides a
Efficacy, Stability, and Safety Evaluation of New Polyphenolic Xanthones Towards Identification of Bioactive Compounds to Fight Skin Photoaging
作者:Diana I. S. P. Resende、Mariana C. Almeida、Bruna Maciel、Helena Carmo、José Sousa Lobo、Carlotta Dal Pozzo、Sara M. Cravo、Gonçalo P. Rosa、Aida Kane-Pagès、Maria do Carmo Barreto、Isabel F Almeida、Maria Emília de Sousa、Madalena M. M. Pinto
DOI:10.3390/molecules25122782
日期:——
stress, making the search for new antioxidant compounds highly desirable in this field. Naturally occurring xanthones are polyphenolic compounds that can be found in microorganisms, fungi, lichens, and some higher plants. This class of polyphenols has a privileged scaffold that grants them several biological activities. We have previously identified simple oxygenated xanthones as promising antioxidants