Isolation, identification and determination of the absolute configuration of Fischerellin B. A new algicide from the freshwater cyanobacterium Fischerella muscicola (Thuret)
摘要:
A new 2-pyrrolidinone with a polyunsaturated side chain has been identified from the cyanobacterium Fischerella muscicola (Thuret). Its structure was elucidated by UV, NMR and mass spectroscopy. Derivatisation of the natural product and stereocontrolled synthesis of the derivative allowed the determination of the absolute configuration by means of chiral gas chromatography. The new compound, fischerellin B, shows algicidal properties. Copyright (C) 1996 Elsevier Science Ltd
Primary α-acetylenic alcohols undergo regio- and stereo-specific additiions of Grignard reagents in the presence of cuprous halides. These reactions yield γ-functionally substituted vinylmagnesium compounds. With secondary and tertiary alcohols, the course of the reaction depends on the nature of alcohol and Grignard reagent.
Die Strukturdynamik von Pentadienylmetall-Verbindungen mit endständiger Alkyl-Gruppe: zugleich «stereoselektive» und «stereodefensive» Synthese eines natürlichen Riechstoffes
作者:Herbert Bosshardt、Manfred Schlosser
DOI:10.1002/hlca.19800630832
日期:1980.12.10
Structural Dynamics of Pentadienyl Metal-Compounds Bearing a Terminal Alkyl Substituent: Both ‘Stereoselective’ and ‘Stereodefensive’ Synthesis of a Natural Perfume.
A general method for the synthesis of pure samples of unsymmetrically disubstituted diacetylenes of the type CH3(CH2)nCCCCCH2OH (n=2,3,4,5) is described in detail. The materials could be polymerized thermally, in the liquid state.
A convenient route to unsymmetrical conjugated diynes
作者:Mouâd Alami、Fabiola Ferri
DOI:10.1016/0040-4039(96)00414-5
日期:1996.4
Various unsymmetricalconjugated diynes can be prepared in good to excellent isolated yields by copper catalyzed coupling reaction of terminal alkynes with 1-iodo alkynes in pyrrolidine. In the case of 1-bromo alkynes, the presence of a catalytic amount of PdCl2(PPh3)2 improved the yield of coupling products.
Effects of Structural Variations on Antibacterial Properties for Conjugated Diynes Generated through Glaser Hay Couplings
作者:Emma A. Hale、Hannah M. Ryan、Alexandra M. McOsker、Cody M. Funk、Lauren C. Green、Lauren E. Mazur、Diya M. Uthappa、Brian M. Flood、Douglas D. Young、Robert J. Hinkle
DOI:10.1002/cmdc.202200455
日期:2022.12.16
A series of conjugateddiynes were prepared via both solution phase and solid-supported Glaser Hay couplings and screened for selective antibacterial activities. A focused structure–activity relationship screen was performed to identify key components of natural product derivatives that were essential for biological activity.
通过溶液相和固载 Glaser Hay 偶联制备了一系列共轭二炔,并筛选了其选择性抗菌活性。进行了重点结构-活性关系筛选,以确定对生物活性至关重要的天然产物衍生物的关键成分。