共查询到19条相似文献,搜索用时 140 毫秒
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苄氧乙基环氧乙烷;不对称合成;由(S)-和( R )-天冬氨酸合成( R )-和(S)-(2-苄氧乙基)环氧乙烷的改良方法 相似文献
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报道了一种基于Dehydro-α-curcumene(4)为关键中间体, 以Sharpless不对称双羟化反应和碘催化的分子内环化成醚反应为关键步骤, 构建2,2,5位三取代的四氢呋喃骨架的方法, 完成了(7R,10S)-Boivinianin B(1)的不对称合成. 合成路线简捷, 对此类化合物的合成有一定的借鉴意义. 相似文献
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(E)-1-氯-6,6-二甲基-2-庚烯-4-炔是合成盐酸特比萘芬的关键中间体,N-氯代二异丙胺/三苯基膦与6,6-二甲基-1-庚烯-4-炔-3-醇反应,可以立体选择性地得到反式的该化合物,其反式/顺式异构体的比例达9/1,为特比萘芬提供了可工业放大生产的立体选择性合成方法。 相似文献
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7—[(4—甲基2—胂酸基苯)偶氮]—8—羟基喹啉—5—磺酸荧光光度法测定氟 总被引:1,自引:0,他引:1
本文介绍了7-[(4-甲基-2-胂酸基苯)偶氮]-8-羟基喹啉-5-磺酸的合成方法以及性能,详细研究了氟对该试剂与铝形成的荧光的熄灭作用,建立了荧光法测定微量氟的新方法。应用于水样和牙膏中的氟的测定,效果良好。 相似文献
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《Analytical letters》2012,45(7):811-829
Abstract Spectropolarimetric back-titrations are described for rhodium(III); the optically active ligand (R, R)-(-)-t?ans-l, 2-cyclohexanediaminetetraacetic acid (R, R(-)CDTA) is used as the complexing agent and cadmium(II) ion as the back-titrant. The optical rotation is monitored throughout the titration, and the optically active ligand and stereospecifically formed complexes serve as self-indicators. The end points are determined graphically by straight-line extrapolations from a plot of volume-corrected observed rotations versus ml of titrant. The rhodium(III) titration plots are representative of normal spectro-polarimetric back-titrations. The range of analyses of rhodium(III) was from 40–0.5 mg. 相似文献
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A. A. Avetisyan I. L. Aleksanyan A. A. Pivazyan 《Chemistry of Heterocyclic Compounds》2005,41(4):471-474
A method has been developed for the synthesis of substituted 4-hydroxy- and 4-amino-2-methyl-3-(2-methylindol-3-yl)methylquinolines by treating the corresponding 4-hydroxy(chloro)-2-methyl-3-(3-oxobutyl)quinolines with phenylhydrazine hydrochloride. It was found that nucleophilic substitution occurred in the case of the 4-chloroquinolines together with subsequent rearrangement to give the 4-amino derivatives. The thiosemicarbazones of the corresponding 4-hydroxy-2-methyl-3-(3-oxobutyl)quinolines were also obtained.__________Translated from Khimiya Geterotsiklicheskikh Soedinenii, No. 4, pp. 554–557, April, 2005. 相似文献
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By condensation of 2-methyl resorcinol with 2-quinolyl acetonitrile, we have synthesized α-(2-quinolyl)-2,4-dihydroxy-3-methylacetophenone, which when reacted with carboxylic acid anhydrides followed by hydrolysis yields 2-R-7-hydroxy-8-methyl-3-(2-quinolyl)chromones.__________Translated from Khimiya Geterotsiklicheskikh Soedinenii, No. 3, pp. 407–415, March, 2005. 相似文献
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(+)-(1S,2S,5R)-8-联苯薄荷醇的合成 总被引:4,自引:0,他引:4
以(R)-( )-pu legone为起始原料,经1,4-加成,还原两步反应合成了手性辅助试剂( )-(1S,2S,5R)-8-联苯薄荷醇及其差向异构体(-)-(1R,2S,5R)-8-联苯薄荷醇,总产率95%。其结构经1H NMR,13C NMR,IR,MS和X-射线衍射仪表征。 相似文献
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Jie YAN Min ZHU College of Pharmaceutical Sciences Zhejiang University of Technology Hangzhou College of Biological Environmental Sciences Zhejiang Shuren University Hangzhou 《中国化学快报》2005,16(4)
Coloradocin, a novel macrolide antibiotic from cultures of Actinoplanes coloradoensis1exhibits activity against pathogenic anaerobic and microaerophilic species2. Because itslow toxicity and substantial oral activity3, , as well as its unusual structure5, several 4research groups initiated approaches towards the synthesis of coloradocin6, whichculminated in the synthesis of 18-deoxynargenicin A1 by Kallmerten et al.7. … 相似文献