The synthesis and anticancer effects of a range of natural and unnatural hop β-acids on breast cancer cells
摘要:
The beta-acids derived from hops (Humulus lupulus L.) are polyphenols classified as lupulones. As part of our on-going interest in the pharmacognosy of these natural products we were keen to investigate the anticancer activity of lupulone 1 as well as individual lupulone congeners. To achieve this we undertook the synthesis of natural as well as unnatural lupulone derivatives and evaluated them for their anticancer activity against the breast cancer cell lines MCF-7 and MDA-MB-231.The results of our investigations revealed that all of the novel unnatural lupulone derivatives that were synthesised were found to be more toxic to MDA-MB-231 cell lines at 72 h than the parent lupulone 1 itself (except for the alpha-substituent R-1 was CH3). Further investigations confirmed that the novel lupulone derivatives were very efficient at killing cancer cells by apoptosis but appear to do so in a time-dependant process. This outcome may be of great significance as MDA-MB-231 cell lines are characterised by an aggressive phenotype with a propensity to invade other tissue, to form metastases as well as an ability to become insensitive to chemotherapeutic agents. (C) 2011 Phytochemical Society of Europe. Published by Elsevier B.V. All rights reserved.
A pair of enantiomeric triketone–phloroglucinol hybrids, (+)- and (−)-myrtuspirone A (1), featuring an unprecedented 3-isopropyl-3H-spiro[benzofuran-2,1′-cyclohexane] backbone, were isolated from the leaves of Myrtus communis. The absolute configuration of each enantiomer of 1 was determined by X-ray diffraction and chemical calculations. Furthermore, the gram-scale total syntheses of (±)-1 and (−)-1
Methicillin-resistantStaphylococcusaureus (MRSA) infections are well-known as a significant global health challenge. In this study, twenty-two congeners of the natural antibiotic rhodomyrtosone B (RDSB) were synthesized with the aim of specifically enhancing the structural diversity through modifying the pendant acyl moiety. The structure–activity relationship study against various MRSA strains revealed
Methicillin-resistant Staphylococcus aureus (MRSA) poses a serious threat to global public health, because it exhibits resistance to existing antibiotics and therefore high rates of morbidity and mortality. In this study, twenty-one natural product-based acylphloroglucinol congeners were synthesized, which possessed different side chains. Antibacterial screening against MRSA strains revealed that acyl
describe a concise catalytic approach to the first asymmetric total syntheses of myrtucommuacetalone, myrtucommuacetalone B, and callistrilones A, C, D and E. The syntheses proceed in only 5–7 steps from the readily available compound 11, without the need for protecting groups. Key features of the syntheses include a unique organocatalytic asymmetric Friedel–Crafts-type Michael addition with high enantioselectivity
在此,我们描述了一种简明的催化方法,用于首次不对称全合成桃金娘醋酮、桃金娘醋酮 B 和卡利斯三酮 A、C、D 和 E。从容易获得的化合物11开始,合成仅需 5-7 个步骤,无需保护团体。该合成的关键特征包括具有高对映选择性和广泛底物范围的独特有机催化不对称弗里德尔-克拉夫茨型迈克尔加成、新颖的迈克尔-缩酮化-成环级联反应以及氧化[3 + 2]环加成。此外,新化合物7对多种多重耐药菌株(MRSA、VISA和VRE)表现出有效的抗菌活性,并且比万古霉素具有更强的效力。
Biomimetic-Inspired Syntheses of Myrtucommuacetalone and Myrtucommulone J
作者:Hongxin Liu、Luqiong Huo、Bao Yang、Yunfei Yuan、Weimin Zhang、Zhifang Xu、Shengxiang Qiu、Haibo Tan
DOI:10.1021/acs.orglett.7b02159
日期:2017.9.15
the first biomimetic total syntheses with structural revision of the acylphloroglucinols myrtucommulone J and myrtucommuacetalone, two biologically meaningful natural products, were achieved through a biosynthetic hemiacetalization/dehydration/[3 + 3]-type cycloaddition domino sequence with high step efficiency. These syntheses result in a corrected structure for myrtucommulone J.