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线叶旋复花化学成份的研究 总被引:1,自引:0,他引:1
Xian-Ye-Xuan-Fu-Hua, the flowers of Inula linariaefolia Turcz (Compositae), is a commonly known Chinese medicinal herb and used as expectorant as well as for the treatment of some malignant tumors. The chemical investigation of its active principles by our early work in 1964 resulted in the isolation of a new sesquiterpene lactone (m.p. 190-192`C, (α)D-24 in CHCl3), which possesses significant inhibitory action against Hela cells and fungi in vitro. Besides, it also shows some expectorant activity in preliminary pharmacological tests. Analyses of the spectral data (IR, UV, ^1H NMR, 13C NMR, MS) and our early results of chemical reactions suggested that the compound is the same as britanin 1 (m.p. 192-194`C, (α)D-26 in CHCl3) studied Chugunov in 1971. However its stereochemistry remained unsolved. On careful examination of the 360 MHZ 1H NMR data (in CDCl3 and in C6D6) and the Cotton effects of ORD spectra of its saturated lactone and cyclopentanone derivatives, we considered that britanin must be ambros-11(13)-en-2β, 4β, 6α, 8α-tetraol-12-oic-(12,8)- lactone, 2, 6-diacetate (7). Since the large values for J6,7, J7,8, J8,9, J9,10 and J1,10 indicate the existence of successive a-a trans coupling in all vicinal protons form C6 to C1, the cofnformation of the cycloheptane ring must be in chair from. The other constitutent isolated from the same plant has been identified as taraxasteryl palmitate. 相似文献
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杀虫植物苦皮藤毒杀成分的研究 总被引:33,自引:0,他引:33
从苦皮藤Celastrus angulatus Max.根皮中分离出5个对粘虫Mythimna separata (walker)具有毒杀活性的新化合物。经高分辨质谱和核磁共振谱鉴定其 结构为1α,2α,6β-三乙酰氧基-4β-羟基-8α-异丁酰氧基9β-呋喃甲酰氧 基-13-异戊酰氧基-β-二氢沉香呋喃(1),1α,2α,6β-二乙酰氧基-4 β-羟基8α,13-二异丁酰氧基-9β-苯甲酰氧基-β-二氢沉香呋喃(2), 1α,2α,6β-三乙酰氧基-4β-羟基-8α-β异丁酰氧基-9β-苯甲酰氧基 -13-异戊酰氧基-β-二氢沉香呋喃(3),1α,6β,8α,13-四乙酰氧基- 2α-羟基-9α-苯甲酰氧基-β-二氢沉香呋喃(4),1α,2α-二乙酰氧基 -4β,6β-二羟基-8β-异丁酰氧基9α-苯甲酰氧基-13-异戊酰氧基-β- 二氢沉香呋喃(5)。它们对5龄粘虫的致死中量LD50分别为91.4,271.5,168.8, 388.0和135.5μg/g。 相似文献
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(+)-莪术二酮系从中药温莪术中分到的抗癌活性成份. 本文研究了由(-)-香芹酮经12步反应合成(-)-莪术二酮的过程, 并以此结果证实了天然(+)-莪术二酮的绝对构型. 相似文献
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蜜环菌菌丝体中倍半萜醇芳香酸酯的质谱研究 总被引:1,自引:0,他引:1
本文报道从蜜环菌(Armilaria mellea)菌丝体分离出的五个倍半萜醇芳香酸酯、即蜜环菌戊素(melleolide, 1)蜜环菌甲素(armillarin, 2), 蜜环菌乙素(armillaridin, 3)蜜环菌丁素(armillaribin, 4)和蜜环菌丙素(armillaricin, 5)的质谱裂解方式和重要的质谱特征, 这些特征为测定该类化合物的化学结构提供了可靠的证据. 相似文献
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大叶桉化学成分的研究 - 大叶桉酚乙和其它成分的分离和鉴定 总被引:1,自引:0,他引:1
从大叶桉叶的乙醇提取物中分离并鉴定出九种已知成分:5-羟基-4',7-二甲氧基6,8-二甲基黄酮,4',5-二羟基-7-甲氧基6,8-二甲基黄酮,3β-羟基-乌索-11-烯-28,13β-内酯,13β-乙酰氧基-乌索-11-烯-28,13β-内酯;3β,28-二羟基-乌索-12-烯,β-谷甾醇,2-甲基5,7-二羟基-苯骈吡喃酮-7β-葡萄糖苷,正卅烷醇和正卅烷酸,另外,分得一种新的酰基间苯三酚类成分,命名为大叶桉酚乙,其结构为2-甲氧基-4,6-二羟基异丁酰基苯,并进行化学合成确证,大叶桉酚乙在管碟法中对金黄色葡萄球菌和枯草杆菌有抑菌作用。 相似文献
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