One new (1) and fifteen known (2–16) p-terphenyls were isolated from a solid culture of the endophytic fungus Aspergillus sp. GZWMJZ-055 by adding the leaves of its host Eucommia ulmoides. Furthermore, nine p-terphenyls (17–25) were synthesized from the main compounds (5–7), among which derivatives 18, 19, 21, 22, and 25 are new p-terphenyls. Compounds 15 and 16 were also, respectively, synthesized from compounds 6 and 7 by oxidative cyclization of air in the presence of silica gel. These p-terphenyls especially those with 4,2′,4″-trihydroxy (4–7, 20, 21) or 4, 4″-dihydroxy-1,2,1′,2′-furan (15, 16) substituted nucleus, exhibited significant antioxidant and α-glucosidase inhibitory activities and lower cytotoxicity to caco-2 cells. The results indicated their potential use as lead compounds or dietary supplements for treating or preventing the diabetes.
一种内生真菌Aspergillus sp. GZWMJZ-055的固体培养物中,通过添加其寄主椴树Eucommia ulmoides的叶子,分离出一种新的(1号)和十五种已知的(2号至16号)p-三联苯。此外,从主要化合物(5号至7号)中合成了九种p-三联苯(17号至25号),其中衍生物18号、19号、21号、22号和25号是新的p-三联苯。化合物15号和16号也分别从化合物6号和7号中在硅胶存在下通过氧化环化合成。这些p-三联苯,特别是那些带有4,2′,4″-三羟基(4号至7号、20号、21号)或4,4″-二羟基-1,2,1′,2′-呋喃(15号、16号)取代核的化合物,表现出显著的抗氧化和α-葡萄糖苷酶抑制活性,并对caco-2细胞的细胞毒性较低。结果表明它们作为先导化合物或膳食补充剂,具有治疗或预防糖尿病的潜力。