Angelmarin (1), a novel anti-cancer agent, was efficiently synthesized through a highly enantioselective epoxidation and a copper cyanide-mediated esterification of the hindered alcohol as the key steps in 53% overall yield.
of plant-derived foods. Tyrosinase inhibitors are very important in medicine, cosmetics and agriculture. In order to develop more active and safer tyrosinase inhibitors, an efficient approach is to modify natural product scaffolds. In this work, two series of novel tyrosinase inhibitors were designed and synthesized by the esterification of cinnamic acidderivatives with paeonol or thymol. Their inhibitory
酪氨酸酶是黑色素生物合成的关键酶,也参与植物性食品的酶促褐变。酪氨酸酶抑制剂在医药、化妆品和农业中非常重要。为了开发活性更高、更安全的酪氨酸酶抑制剂,一种有效的方法是对天然产物支架进行修饰。本工作通过肉桂酸衍生物与丹皮酚或百里酚的酯化反应设计并合成了两个系列的新型酪氨酸酶抑制剂。评估了它们对蘑菇酪氨酸酶的抑制作用。大多数这些化合物(IC 50:2.0 至 163.8 μM)被发现是比其母体化合物(IC 50:121.4 至 5925.0 μM)更好的抑制剂。其中,( E )-2-乙酰基-5-甲氧基苯基-3-(4-羟基苯基)丙烯酸酯( 5a )、( E )-2-乙酰基-5-甲氧基苯基-3-(4-甲氧基苯基)丙烯酸酯( 5g ) ( E )-2-异丙基-5-甲基苯基-3-(4-羟基苯基)丙烯酸酯( 6a )表现出很强的抑制活性;与阳性对照曲酸(IC 50 :32.2 μM)相比, IC 50值分别为2
Synthesis and biological evaluation of coumarin derivatives as α-glucosidase inhibitors
In this study, two series of coumarinderivatives 5a∼i and 6a∼i were synthesized, and their inhibitory activity against α-glucosidase was determined. The results indicated that most of the synthesized derivatives exhibited prominent inhibitory activities against α-glucosidase. Among them, compounds 5a and 5b showed the strongest inhibition with the IC50 values of 19.64 μM and 12.98 μM, respectively
Synthesis of coumarin derivatives and their cytoprotective effects on t -BHP-induced oxidative damage in HepG2 cells
作者:Tomomi Ando、Mina Nagumo、Masayuki Ninomiya、Kaori Tanaka、Robert J. Linhardt、Mamoru Koketsu
DOI:10.1016/j.bmcl.2018.06.018
日期:2018.8
Coumarins are ubiquitous in higher plants and exhibit various biological actions. The aim of this study was to investigate the structure-activity relationships of coumarinderivatives on tert-butyl hydroperoxide (t-BHP)-induced oxidative damage in human hepatoma HepG2 cells. A series of coumarinderivatives were prepared and assessed for their cytoprotective effects. Among these, a caffeoyl acid-conjugated
conjugates were obtained with various degrees of substitution (DS) ranging from 3% to 60%. The conjugates were found to be bactericidal against Staphylococcus aureus and Escherichia coli, with their activities equal to chitosan at low DS but an increase in the DS correlated with reduced activity. DPPH (2,2-diphenyl-1-picrylhydrazyl) scavenging assay was performed to determine the EC50 values. Chitosan