Coumarins with an unprecedented tetracyclic skeleton and coumarin dimers from chemically engineered extracts of a marine-derived fungus
作者:Hitoshi Kamauchi、Masahiro Noji、Kaoru Kinoshita、Toshikatsu Takanami、Kiyotaka Koyama
DOI:10.1016/j.tet.2018.04.033
日期:2018.6
tetracyclic coumarin derivatives 1 and 2 and the coumarin dimers 3–5 were isolated from chemically engineered extracts (coumarin dimerization of natural extract) of the marine-derived fungus Eurotium rubrum. The structures of these compounds were established using NMR, MS and IR methods. The absolute configuration of 1 was determined by ECD calculations. The unprecedented tetracyclic coumarin skeleton
前所未有的四环香豆素衍生物1和2和香豆素二聚体3 - 5是从的海洋来源的真菌化学工程改造的萃取物(天然提取物的香豆素二聚化)分离散囊菌癣菌。这些化合物的结构是使用NMR,MS和IR方法建立的。的绝对构型1,通过ECD计算确定。史无前例的四环香豆素骨架是由多米诺-Knoevenagel-Diels-Alder反应生成的。化合物1 - 5表明酪氨酸酶的抑制活性(IC 50 分别为1.7、1.2、4.9、1.8和2.9μM)。分离的香豆素衍生物1 - 5不是由HPLC分析中的粗提取物中观察到E.癣菌,这表明化学工程改造的萃取物产生具有酪氨酸酶抑制活性的这些新的香豆素衍生物。