描述了由烷基取代的乙酰丙酸衍生物通过溴化和酸促进的内酯化合成乙基,丁基,己基和十二烷基取代的溴化物。使用乙酰丙酸作为模型,研究了潜在的反应,并讨论了改变溴化条件和改变酸浓度对产物分布的影响。二溴化在CHCl 3中进行得最好,在无EtOH的CHCl 3中进行,而不会形成酯。在98–100%H 2 SO 4中伴随氧化发生环化反应,但在100%H 2 SO 4中产生环戊内酯的产率最高。还描述了相关的贝克雷利物质的形成。
描述了由烷基取代的乙酰丙酸衍生物通过溴化和酸促进的内酯化合成乙基,丁基,己基和十二烷基取代的溴化物。使用乙酰丙酸作为模型,研究了潜在的反应,并讨论了改变溴化条件和改变酸浓度对产物分布的影响。二溴化在CHCl 3中进行得最好,在无EtOH的CHCl 3中进行,而不会形成酯。在98–100%H 2 SO 4中伴随氧化发生环化反应,但在100%H 2 SO 4中产生环戊内酯的产率最高。还描述了相关的贝克雷利物质的形成。
Reinvestigation of the sulfuric acid-catalysed cyclisation of brominated 2-alkyllevulinic acids to 3-alkyl-5-methylene-2(5H)-furanones
作者:Anthony J. Manny、Staffan Kjelleberg、Naresh Kumar、Rocky de Nys、Roger W. Read、Peter Steinberg
DOI:10.1016/s0040-4020(97)10034-5
日期:1997.11
through bromination and acid promoted lactonisation is described. The underlying reactions have been investigated using levulinic acid as a model, and the effects of varying the bromination conditions and changing acid concentration on product distribution are discussed. Dibromination proceeds best in CHCl3 and proceeds in EtOH-free CHCl3 without the complication of ester formation. Cyclisation occurs
描述了由烷基取代的乙酰丙酸衍生物通过溴化和酸促进的内酯化合成乙基,丁基,己基和十二烷基取代的溴化物。使用乙酰丙酸作为模型,研究了潜在的反应,并讨论了改变溴化条件和改变酸浓度对产物分布的影响。二溴化在CHCl 3中进行得最好,在无EtOH的CHCl 3中进行,而不会形成酯。在98–100%H 2 SO 4中伴随氧化发生环化反应,但在100%H 2 SO 4中产生环戊内酯的产率最高。还描述了相关的贝克雷利物质的形成。
Structure–activity relationship of brominated 3-alkyl-5-methylene-2(5H)-furanones and alkylmaleic anhydrides as inhibitors of Salmonella biofilm formation and quorum sensing regulated bioluminescence in Vibrio harveyi
作者:Hans P. Steenackers、Jeremy Levin、Joost C. Janssens、Ami De Weerdt、Jan Balzarini、Jos Vanderleyden、Dirk E. De Vos、Sigrid C. De Keersmaecker
DOI:10.1016/j.bmc.2010.05.055
日期:2010.7
A library of 25 10-unsubstituted and 10-bromo or 10-acetoxy 3-alkyl-5-methylene-2(5H)-furanones and two 3-alkylmaleic anhydrides was synthesized using existing and new methods. This library was tested for the antagonistic effect against the biofilm formation by Salmonella Typhimurium and the quorum sensing regulated bioluminescence of Vibrio harveyi. The length of the 3-alkyl chain and the bromination pattern of the ring structure were found to have a major effect on the biological activity of the 10-unsubstituted furanones. Remarkably, the introduction of a bromine atom on the 10 position of the 3-alkyl chain did drastically enhance the activity of the furanones in both biological test systems. The introduction of an acetoxy function in this position did in general not improve the activity. Finally, the potential of the (bromo) alkylmaleic anhydrides as a new and chemically easily accessible class of biofilm and quorum sensing inhibitors was demonstrated. (C) 2010 Elsevier Ltd. All rights reserved.