共查询到20条相似文献,搜索用时 125 毫秒
1.
2.
从中药升麻的地道药材之一兴安升麻[Cimicifuga dahurica(Turcz.) Maxim.]的根茎中分得两个新的环菠萝蜜烷型三萜双糖苷, 分别命名为升麻苷C(cimiside C,1)和升麻苷D(cimiside D,2)。它们的结构经IR, MS, 1^H和13^C NMR, 1^H-1^H COSY,1^H-1^H TOCSY, 13^C-1^H COSY, 13^C-1^H COLOC及DEPT测定, 确定为(23R, 24R)-24-异乙酰氧基-shengmanol-3-O-β-D-吡喃木糖-15-O-β-D-吡喃葡萄糖苷和(23R,24R)-24-异乙酰氧基-shengmanol-3-O-β-D-吡喃来苏糖-15-O-β-D-吡喃葡萄糖苷。 相似文献
3.
中药升麻的化学成分III. 升麻苷C和升麻苷D的化学结构 总被引:3,自引:0,他引:3
从中药升麻的地道药材之一兴安升麻[Cimicifuga dahurica(Turcz.) Maxim.]的根茎中分得两个新的环菠萝蜜烷型三萜双糖苷, 分别命名为升麻苷C(cimiside C,1)和升麻苷D(cimiside D,2)。它们的结构经IR, MS, 1^H和13^C NMR, 1^H-1^H COSY,1^H-1^H TOCSY, 13^C-1^H COSY, 13^C-1^H COLOC及DEPT测定, 确定为(23R, 24R)-24-异乙酰氧基-shengmanol-3-O-β-D-吡喃木糖-15-O-β-D-吡喃葡萄糖苷和(23R,24R)-24-异乙酰氧基-shengmanol-3-O-β-D-吡喃来苏糖-15-O-β-D-吡喃葡萄糖苷。 相似文献
4.
云南大花红景天化学成分研究 总被引:14,自引:0,他引:14
从云南丽江产民间药物大花红景天(Rhodiola crenulata)根的乙醇提取物中分离得到10个化合物, 经化学方法和光谱数据分析, 10个化合物结构鉴定为: 山奈酚(1), 山奈酚7-O-α-L-鼠李糖苷(2), 大花红景天苷(3), 草质素7-O-α-L-鼠李糖苷(4), 草质素7-O-(3"-O-β-D-葡萄糖基)-α-L-鼠李糖苷(5), 大花红景天素(6),鞣花酸(7), 红景天苷(8), 没食子酸(9), 没食子酸乙酯(10)。其中化合物1, 2,3, 6, 7是首次从大花红景天中得到, 化合物3-为一新的山奈酚苷, 用13^C NMR,1^H-1^H COSY, 13^C-1^H COSY谱确证6为一种结构罕见的黄酮醇与苯丙素结合而成的化合物。 相似文献
5.
6.
7.
In the presence of KF·2H2O, furoylmethyltriphenylarsonium bromide (1a) or thienoylmethyltriphenylarsonium bromide (1b) reacted with 2-[(un)substituted benzylidene]malononitrile (2) in chloroform at room temperature to give trans-3,3-dicyano-1-furoyl-2-[(un)substituted phenyl]cyclopropane (3a) or trans-3,3-dicyano-1-thienoyl-2- [(un)substituted phenyl]cyclopropane (3b) respectively in good yield with high stereoselectivity. The structures of product 3 were confirmed by IR, MS, 1^H NMR, 1^H-1^H COSY and microanalysis. The relative configuration of product 3 was determined by 1^H-1^H NOESY technique. The mechanism for the formation of product 3 was also proposed. 相似文献
8.
9.
10.
ω-溴代芳香基乙酮与3-(D-葡萄糖-1-基)-4-氨基-5-巯基-1,2,4-三唑反应 合成了一系列新颖的3-(D-葡萄糖-1-基)-6-芳基-7H-1,2,4三唑并[3,4-b[1,3 ,4]噻二嗪.用元素分析,IR,NMR,MS对其结构进行了表征,研究了其NMR波谱特 征,并以^1H-^1H COSY,^13C-^1H COSY,COLOC二维NMR技术对其^1H NMR,^13C NMR的谱峰进行了全归属 相似文献
11.
12.
Two new steroids, named 4α,22-dimethyl-Cholest-22-en-3β-ol (1) and 4α-methyl-Cholest-7,22-dien-3β-ol (2), along with two known steroids, were isolated from the soft coral Sinularia brassica. The structures of the new compounds were determined on the basis of extensive spectroscopic data (MS, (1)H and (13)C NMR, (1)H-(1)H COSY, (13)C-(1)H COSY, HMBC and NOESY) analysis. 相似文献
13.
利用一维NMR方法研究了新型聚芳醚酮大环化合物的影响,用二维同核^1H-^1H COSY和^13C-^1H COSY实验方法以及类似物质标准谱图的比较,对一维NMR谱峰进行了归属。 相似文献
14.
Compounds 1-7 form a novel group of dithiocarbamates, first synthesized from the reaction of a series of primary amines with carbon disulfide and 3-bromo ethyl pyruvate in the presence of anhydrous potassium phosphate. Structure elucidation of this group of compounds was accomplished using extensive 1D and 2D NMR spectroscopic studies, including (1)H, (13)C, COSY, NOESY, HSQC, and gHMBC experiments. The distinction between the linear structures I, II and the cyclic structure III was made mainly on the basis of the analysis of the cross peak between H-2 and H-4a in the COSY spectra, in combination with the long-range correlation between H-2 and C-4, 6 in the gHMBC spectra. 相似文献
15.
16.
17.
Parthiban P Balasubramanian S Aridoss G Kabilan S 《Spectrochimica acta. Part A, Molecular and biomolecular spectroscopy》2008,70(1):11-24
Variously substituted 2,6-diarylpiperidin-4-one O-benzyloximes were synthesized by the direct condensation of the corresponding 2,6-diarylpiperidin-4-ones with O-benzylhydroxylamine hydrochloride. All the synthesized compounds are characterized by IR, Mass and NMR spectral studies. NMR spectral assignments are made unambiguously by their one-dimensional (1H NMR and 13C NMR) and two-dimensional (1H-1H COSY, NOESY, HSQC and HMBC) NMR spectra. All the synthesized compounds are resulted as single isomer, i.e., exclusively E isomer (9-14). The conformational preference of 2,6-diarylpiperidin-4-one oxime ethers with and without alkyl substituents at C-3 and C-5 has also been discussed using the spectral studies. The observed chemical shifts and coupling constants suggest that compounds 8-13 adopt normal chair conformation with equatorial orientation of all the substituents while compound 14 contributes significant boat conformation along with the predominant chair conformation in solution. The effect of oximination on ring carbons, their associated protons, alkyl substituents and ipso carbons are studied. Every proton in the piperidone ring of the oxime ether is observed as distinct signal due to oximination. The order of chemical shift magnitude in compound 8 is H-2a>H-6a>H-5e>H-3e>H-3a>H-5a. For 9-12, the order is H-6a>H-5e>H-2a>H-3a>H-5a, for 13, H-6a>H-2a>H-5e>H-3a>H-5a and for 14, the order is H-2a>H-6a>H-5e>H-3a>H-5a while the 13C chemical shift magnitude for 8-14 due to oximination is C-2>C-6>C-3>C-5. 相似文献
18.
Chiritafimbrisepala Hand.-Mazz. (Gesneriaceae), commonly called "Mahuangchi" inChina, is distributed mainly in Southern China. As an anti-inflammatory Chinese folkmedicine. the root is used for the treatment of inflammations, such as hepatitis andgastroenteritis. The characteristic constituents of the family are flavonoids.Mahuangchiside I was obtained as yellow granular crystals (MeOH) from theextract of 90%EtOH, mp. 212-213"C. It is positive to Mg-HCI and Molish tests. TheUV absorp… 相似文献
19.