Terresoxazine,A Novel Compound with Benzoxazine Skeleton from Tribulus terrestris

Terresoxazine, a novel benzoxazine derivative was isolated from the fruits of Tribulus terrestris. Its structure was determined as 7-hydroxy-3, 3a-dihydro-5H-pyrrolo-[1,2-a] [3,1] -benzoxazin-1(2H)-one, on the basis of the spectral techniques and X-ray crystallographic analysis.

苍耳子的化学成分研究

研究菊科植物苍耳Xanthium sibiricum的干燥成熟带总苞的果实(苍耳子)的化学成分。采用硅胶柱色谱,Sephadex LH-20,ODS和HPLC等色谱方法进行分离纯化,并结合HR-ESI-MS与现代波谱学技术鉴定化合物结构。采用脂多糖(LPS)诱导的巨噬细胞RAW264.7为筛选模型评价分离得到化合物的抗炎活性。从苍耳子95%乙醇提取物的乙酸乙酯萃取物中分离得到了21个化合物,分别鉴定为尿嘧啶(1),胸腺嘧啶(2),尿苷(3),吲哚-3-甲醛(4),吲哚-3-甲酸(5),2′-O-methyluridine(6),鸟苷(7),2,4(1H,3H)-quinazolinedione(8),3-hydroxy-3-(2-hydroxyethyl)indolin-2-one(9),nicotinamide(10),N-acetyl-L-phenylalaninol(11),heliolactam(12),terresoxazine(13),告达亭(14),qingyangshengenin(15),告达亭-3-O-β-D-夹竹桃吡喃糖基-(1→4)-β-D-加拿大麻吡喃糖基-(1→4)-β-D-加拿大麻吡喃糖苷(16),告达亭-3-O-β-D-加拿大麻吡喃糖基-(1→4)-β-D-夹竹桃吡喃糖基-(1→4)-β-D-加拿大麻吡喃糖基-(1→4)-β-D-加拿大麻吡喃糖苷(17),caudatin-3-O-α-L-cymaropyranosyl-(1→4)-β-D-cymaropyranosyl-(1→4)-β-D-cymaropyranosyl-(1→4)-α-L-cymaropyranosyl-(1→4)-β-D-oleandropyranosyl-(1→4)-β-D-cymaropy-ranoside(18),qinyangshengenin-3-O-β-D-oleandropyranosyl-(1→4)-β-D-oleandropyranosyl-(1→4)-β-D-cymaropyranoside(19),qinyangshengenin-3-O-β-D-oleandropyranosyl-(1→4)-β-D-cymaropyranosyl-(1→4)-β-D-digitoxopyranoside(20),rostratamine-3-O-β-D-oleandropyranosyl-(1→4)-β-D-cymaropyranosyl-(1→4)-β-D-cymaropyranoside(21)。化合物5~21为首次从苍耳属植物中分离得到。对分离得到的21个化合物进行抗炎活性筛选,其中,化合物12~13具有抗炎活性,其IC50分别为(15.45±0.56),(20.14±0.78)μmol·L-1。