海南粗榧抗肿瘤有效成分的研究

自海南粗榧树皮中共分离出11种生物碱,其中9种生物碱经鉴定分别为脱氧三尖杉酯碱(Ⅰ)、异三尖杉酯碱(Ⅱ)、三尖杉酯碱(Ⅲ)、高三尖杉酯碱(Ⅳ)、三尖杉碱(Ⅴ)、桥氧三尖杉碱(Ⅵ)、脱甲基三尖杉酮碱(Ⅶ)、3-表西哈灭里辛碱(Ⅷ)、表三尖杉碱(Ⅺ),碱Ⅸ为一种新生物碱,碱Ⅹ的结构尚待进一步研究.动物试验结果表明碱Ⅰ、Ⅱ、Ⅲ和Ⅳ能延长白血病小鼠 L_(615)的生命,碱Ⅴ、Ⅵ、Ⅶ和Ⅹ则无明显活性.碱Ⅰ、Ⅱ、Ⅲ和Ⅳ已经临床试用,初步观察到碱Ⅲ对急性和慢性粒细胞白血病有一定疗效.碱Ⅰ、Ⅱ和Ⅳ的疗效正在观察中.     

异三尖杉酯碱及其类似物立体异构体的薄层制备

薄层色谱可有效地用于异三尖杉酯碱(IH-3)与其立体异构体(IH-1,2,4),高异三尖杉酯碱(HIH-C)与其立体异构体(HIH-A,B,D)的分离制备、各立体异构体已鉴定。另外对三种不含三尖杉碱母核的异三尖杉酯碱类似物——异三尖杉酯碱侧链酸甲酯(ISM)、异三尖杉酯碱侧链酸乙酯(ISE)、异三尖杉酯碱侧链酸苄酯(ISB)的苏式(threo)、赤式(erythro)异构体也进行了薄层分离并予以鉴定。通过制备薄层分得的ISM(t)、ISM(e),其HNMR分别与文献报导相同。另外将分离得到的ISE(t)、ISE(e)中的     

三尖杉属植物中生物碱的研究--Ⅱ.三尖杉(Cephalotaxus fortunei Hook.f.)中的四种微量生物碱的分离和鉴定及福建三尖杉碱的化学结构

本文报导了三尖杉中分离得到的四种微量生物碱的理化性质.三尖杉碱-9(Ⅰ)、三尖杉碱-3(Ⅱ)分别鉴定为已知生物碱,11-羟基三尖杉碱和表-台湾三尖杉碱.三尖杉碱-15为一种新生物碱,命名为福建三尖杉碱(cephalofortuneine),经光谱分析(红外、紫外、核磁共振和质谱)推测其化学结构为Ⅳ.三尖杉碱-2的结构未定.     

雷公藤碱乙、碱庚和碱己的结构

雷公藤(Tripterygium wilfordii Hook.f.)系卫矛科雷公藤属植物。前已报道了雷公藤次碱(wilforine,l)、雷公藤碱及新生物碱雷公藤碱戊的结构。本文报告雷公藤碱已(wilformine,2),雷公藤碱乙(wilforgine,3)及雷公藤碱庚(wilforzine,4)的结构,2为首次分得之新生物碱,3、4结构系首次报道。     

贡甲根中生物碱的化学研究

从芸香科植物贡甲(Acronychia oligophylebia Merr.)的根中分得了九个生物碱1～9和β-谷甾醇(10),其中吴茱萸春(1)、香草木宁(3)、原茵芋碱(4)、茵芋碱(5)和斑点弗林定(6)是已知生物碱,1,4,6三个生物碱是第一次从山油柑属植物中分得.贡甲定碱(2)和贡甲辛定碱(9)是两个新化合物.贡甲辛碱(7)和贡甲碱(8)是首次从植物中分得.用光谱方法推断了2,7,8,9的结构,由合成证明7,9的结构. 7和8具广谱抗真菌作用,但作用较弱.     

石蒜科生物碱的研究Ⅴ.臭水仙中的生物碱及新生物碱臭水仙碱的结构

从臭水仙(Narcissus papyraceus Ker-Gawl)的鳞茎中分离和鉴定了六个已知生物碱:石蒜碱(1)、多花水仙碱(2)、加兰他敏(3)、力可拉敏(4)、假石蒜碱(5)和maritidine(6).此外还分到一种新生物碱臭水仙碱(Papyramine),根据化学和光谱(UV,IR,ORD,NMR)数据证明其化学结构为7.     

膝瓣乌头根中新去甲二萜生物碱的结构研究

从膝瓣乌头(AconitumgeniculatumFlectcher)根中分得3个新的乌头碱型去甲二萜生物碱。由光谱法(^1HNMR,^1^3CNMR和MS)确定其结构为膝乌宁碱甲(genicunineA)1,膝乌宁碱乙(genicunineB)2,膝乌宁碱丙(genicunineC)3。     

两面针抗肿瘤有效成分的研究

自两面针根中共分离出七种生物碱,其中六种生物碱经鉴定分别为氯化两面针碱(1)、氧化两面针碱(2)、二氢两面针碱(3)、6-甲氧基-5,6-二氢白屈菜红碱(4)、α-别隐品碱(5)和茵芋碱(6),7的结构尚待进一步研究。动物试验结果表明,1和4能延长小鼠艾氏腹水癌的生命;2、3、5和6则无明显活性。1已在临床试用,初步观察,对慢性粒细胞型白血病有近期疗效。     

双吡咯烷类生物碱的质谱断键机理研究——Ⅰ.吊裙草碱、光萼猪屎豆碱、美丽猪屎豆碱和二乙酰化野百合碱

通过高分辨质谱分析、重氢标记和亚稳态离子的测定,对吊裙草碱(1)、光萼猪屎豆碱(3)、美丽猪屎豆碱(5)和二乙酰野百合碱(6)的断键机理进行了研究。     

有碱玻璃纤维的性能及其最新发展方向

发展有碱玻璃纤维的意义在整个玻璃纤维工业中,产量所占比重最大的是无碱铝硼硅酸盐玻璃纤维(简称无碱玻璃纤维)和有碱无硼硅酸盐玻璃纤维(简称有碱玻璃纤维)二种。其他如无碱无硼和石英玻璃纤维等,所占比重就较小。这     

Furyl- and thienyl-silatranes and germatranes

We review our research on the synthesis and study of the physical and biological properties of furyl- and thienylgermatranes and -silatranes.Translated from Khimiya Geterotsiklicheskikh Soedinenii, No. 6, pp. 725–732, June, 1992.     

Review and patents and literature

The use of the insect cell/baculovirus expression system for producing recombinant proteins of bacterial, plant, insect, and mammalian origin has become widespread. The popularity of this eukaryotic expression system is due to many factors, including (1) potentially high protein expression levels, (2) ease and speed of genetic engineering, (3) ability to accommodate large DNA inserts, (4) protein processing similar to higher eukaryotic cells (e.g., mammalian cells), and (5) ease of insect cell growth (e.g., suspension growth). The following review of the literature discusses two engineering aspects of recombinant protein synthesis by insect cell cultures: bioreactor scale-up and insect cell line selection. Following this review patent abstracts and additional literature pertaining to expression of recombinant proteins in insect cell culture are listed.     

Ground- and excited-state aromaticity and antiaromaticity in benzene and cyclobutadiene

The aromaticity and antiaromaticity of the ground state (S 0), lowest triplet state (T 1), and first singlet excited state (S 1) of benzene, and the ground states (S 0), lowest triplet states (T 1), and the first and second singlet excited states (S 1 and S 2) of square and rectangular cyclobutadiene are assessed using various magnetic criteria including nucleus-independent chemical shifts (NICS), proton shieldings, and magnetic susceptibilities calculated using complete-active-space self-consistent field (CASSCF) wave functions constructed from gauge-including atomic orbitals (GIAOs). These magnetic criteria strongly suggest that, in contrast to the well-known aromaticity of the S 0 state of benzene, the T 1 and S 1 states of this molecule are antiaromatic. In square cyclobutadiene, which is shown to be considerably more antiaromatic than rectangular cyclobutadiene, the magnetic properties of the T 1 and S 1 states allow these to be classified as aromatic. According to the computed magnetic criteria, the T 1 state of rectangular cyclobutadiene is still aromatic, but the S 1 state is antiaromatic, just as the S 2 state of square cyclobutadiene; the S 2 state of rectangular cyclobutadiene is nonaromatic. The results demonstrate that the well-known "triplet aromaticity" of cyclic conjugated hydrocarbons represents a particular case of a broader concept of excited-state aromaticity and antiaromaticity. It is shown that while electronic excitation may lead to increased nuclear shieldings in certain low-lying electronic states, in general its main effect can be expected to be nuclear deshielding, which can be substantial for heavier nuclei.     

Determination and study on residue and dissipation of benazolin-ethyl and quizalofop-p-ethyl in rape and soil

A QuEChERS (quick, easy, cheap, effective, rugged, and safe) method for the determination of benazolin-ethyl and quizalofop-p-ethyl in rape and soil by high-performance liquid chromatography-tandem mass spectrometry has been developed in this study. The residue and dissipation of benazolin-ethyl and quizalofop-p-ethyl in rape and soil were determined with the developed method. The half-lives of benazolin-ethyl in rape straw and soil were 3.7–5.1 days and 14.3–26.3 days, respectively. The half-lives of quizalofop-p-ethyl in rape straw and soil were 5.0-6.1 days and 0.3–9.7 days, respectively. The residue of benazolin-ethyl and quizalofop-p-ethyl in rapeseed and soil were below the detection limit (i.e., 0.5?mg?kg^?1, the maximum residue level of European Union for quizalofop-p-ethyl).     

Syntheses and structures of P-anilino-P-chalcogeno- and P-anilino-P-iminodiazasilaphosphetidines and their group 12 and 13 metal compounds

The P-anilino-P-chalcogeno(imino)diazasilaphosphetidines [Me(2)Si(mu-N(t)Bu)(2)P=E(NHPh)] (E = O (3), S (4), Se (5), N-p-tolyl (6)) were synthesized by oxidizing the P-anilinodiazasilaphosphetidine [Me(2)Si(N(t)Bu)(2)P(NHPh)] (2) with cumene hydroperoxide, sulfur, selenium, and p-tolyl azide, respectively. The lithium salt of 4 reacted with thallium monochloride to produce ([Me(2)Si(mu-N(t)Bu)(2)P=S(NPh)-kappaN-kappaS]Tl)(7), which features a two-coordinate thallium atom. Treatment of 4-6 with AlMe(3) gave the monoligand dimethylaluminum complexes ([Me(2)Si(mu-N(t)Bu)(2)P=E(NPh)-kappaN-kappaE]AlMe(2)) (E = S (8), Se (9), N-p-tolyl (10)), respectively. In these complexes the aluminum atom is tetrahedrally coordinated by one chelating ligand and two methyl groups, as a single-crystal X-ray analysis of 8 showed. A 2 equiv amount of 4-6 reacted with diethylzinc to produce the homoleptic diligand complexes ([Me(2)Si(mu-N(t)Bu)(2)P=E(NPh)-kappaN-kappaE](2)Zn)(E = S (11), Se (12), N-p-tolyl (13)). A crystal-structure analysis of 11 revealed a linear tetraspirocycle with a tetrahedrally coordinated, central zinc atom.     

多环芳二酐型聚酯亚胺膜的透气性能

多环芳二酐型聚酯亚胺膜的透气性能李悦生，丁孟贤，徐纪平（浙江大学高分子科学与工程研究所，杭州，３１００２７）（中国科学院长春应用化学研究所）关键词聚醚酰亚胺，聚酯酰亚胺，膜，透气性通常的聚酰亚胺加工性能较差，在芳环二酐的苯环间引入醚键等柔性基团后，其...