A biomimetic type expedient approach to the tricyclic core of xyloketals. Application to a short, stereocontrolled synthesis of alboatrin and a remarkable epi to natural isomerisation
作者:Debayan Sarkar、Subrata Ghosh、Ramanathapuram V. Venkateswaran
DOI:10.1016/j.tetlet.2009.01.086
日期:2009.4
An expedientsynthesis of the linear tetrahydrofurano benzopyran ring system of xyloketals is described involving an ortho ester Claisen rearrangement and an intramolecular cationic cyclisation. This strategy was applied for a short, stereocontrolled and high yield synthesis of the phytotoxic metabolite alboatrin.
Tetrahydrothiophene-Catalyzed Synthesis of Benzo[<i>n</i>.1.0] Bicycloalkanes
作者:Long-Wu Ye、Xiu-Li Sun、Chuan-Ying Li、Yong Tang
DOI:10.1021/jo062209m
日期:2007.2.1
A catalytic intramolecular cyclopropanation for the preparation of benzobicycliccompounds with [n.1.0] units has been developed. In the presence of 20 mol % of tetrahydrothiophene, the reactions of compounds 2a−2h afford versatile benzo[n.1.0]bicycloalkanes with excellent stereoselectivity in moderate to good isolated yields.
用于与benzobicyclic化合物的制备的催化分子内环丙烷[ Ñ .1.0]单元已经研制成功。在存在20 mol%的四氢噻吩的情况下,化合物2a - 2h的反应可提供具有良好立体选择性的通用的苯并[ n .1.0]双环烷烃,分离产率中等至良好。
An In-Depth Study on Ring-Closing Metathesis of Carbohydrate-Derived α-Alkoxyacrylates: Efficient Syntheses of DAH, KDO, and 2-Deoxy-β-KDO
作者:Koen F. W. Hekking、Marcel A. H. Moelands、Floris L. van Delft、Floris P. J. T. Rutjes
DOI:10.1021/jo060913x
日期:2006.8.1
Novel, efficient synthetic pathways to DAH, KDO, and 2-deoxy-β-KDO are described. Ring-closingmetathesis (RCM) of highly functionalized α-alkoxyacrylate fragments resulted in a series of synthetically versatile oxygen heterocyclic intermediates. Further functionalization of the resulting enol ether double bond and subsequent deprotection provided the natural products in high overall yields, starting
Unexpected Tandem Ylide Annulation Reaction for Controllable Synthesis of 2<i>H</i>-Chromenes and 4<i>H</i>-Chromenes
作者:Long-Wu Ye、Xiu-Li Sun、Chun-Yin Zhu、Yong Tang
DOI:10.1021/ol0615174
日期:2006.8.1
An unexpected tetrahydrothiophene-catalyzed ylide annulation reaction, via tandem Michael addition/elimination/substitution, for the controllable synthesis of 2H-chromenes and 4H-chromenes has been developed.
[EN] CHROMAN COMPOUNDS AS 5 -HTlB ANTAGONISTS<br/>[FR] COMPOSES CHROMANE UTILISES EN TANT QU'ANTAGONISTES DES 5-HT1B
申请人:ASTRAZENECA AB
公开号:WO2007053094A1
公开(公告)日:2007-05-10
[EN] Chroman derivatives according to Formula (I) below: wherein R1, R2, R3 ,and R4 are as defined in the specification, pharmaceutically-acceptable salts, methods of making, pharmaceutical .compositions containing and methods for using the'' same. The compounds are 5-HT1B antagonists and are useful in the treatment of mood and . anxiety disorders as well as cognitive disorders. [FR] L'invention concerne des dérivés de chromane de formule (I) dans laquelle R1, R2, R3, et R4 sont tels que définis dans la description, des sels pharmaceutiquement acceptables de ces dérivés, des procédés de production correspondants, des compositions pharmaceutiques les contenant, ainsi que des procédés d'utilisation desdits composés. Ces composés sont des antagonistes des 5-HT1B et peuvent servir à traiter les troubles de l'humeur et les troubles anxieux, ainsi que les troubles cognitifs.