Five new compounds, including a benzopyran ribonic glycoside, daldiniside A (1), two isocoumarin ribonic glycosides, daldinisides B (2) and C (3), and two alkaloids, 1-(3-indolyl)-2R,3-dihydroxypropan-1-one (4) and 3-ethyl-2, 5-pyrazinedipropanoic acid (5), along with five known compounds (6-10), were isolated from the EtOAc extract of the marine-associated fungus, Daldinia eschscholzii. Their structures were elucidated by extensive physicochemical and spectroscopic properties, besides comparison with literature data. The absolute configurations of compounds 1-3 were corroborated by chemical transformation, GC analysis and X-ray crystallographic analysis. Meanwhile, the absolute configuration of compound 4 and the planar structure of compound 6 were also determined based on the X-ray diffraction analysis. The cytotoxicity of compounds 1-10, antifungal and anti-HIV activities of compounds 1-5 and the in vitro assay for glucose consumption of compounds 1-3 were done in the anti-diabetic model, whereas none showed obvious activity.
1.Huazhong Univ Sci & Technol, Tongji Med Coll, Sch Pharm, Hubei Key Lab Nat Med Chem & Resource Evaluat, Wuhan 430030, Peoples R China 2.Huazhong Univ Sci & Technol, Tongji Med Coll, Tongji Hosp, Wuhan 430030, Peoples R China 3.Chinese Acad Sci, Kunming Inst Bot, State Key Lab Phytochem & Plant Resources West Ch, Kunming 650204, Peoples R China
Hu,Zheng-Xi;Xue,Yong-Bo;Bi,Xiao-Bin;Zhang,Jin-Wen;Luo,Zeng-Wei;Li,Xiao-Nian;Yao,Guang-Min;Wang,Jian-Ping;Zhang,Yong-Hui.Five New Secondary Metabolites Produced by a Marine-Associated Fungus, Daldinia eschscholzii,MARINE DRUGS,2014,70(45):8723-8729