Synthesis of (±)- and (−)-Vibralactone and Vibralactone C
作者:Quan Zhou、Barry B. Snider
DOI:10.1021/jo8015743
日期:2008.10.17
Mander reductive alkylation of methyl 2-methoxybenzoate with prenyl bromide and hydrolysis of the enolether afforded methyl 6-oxo-1-prenyl-2-cyclohexenecarboxylate. This was converted in five steps (reduction of the ketone, saponification, iodolactonization, ozonolysis, and intramolecular aldol reaction) to a spiro lactone cyclopentenal. An efficient first synthesis of (+/-)-vibralactone was completed
hydrolysis, iodolactonization, ozonolysis, and intramolecular aldol reaction provided a spiro lactone cyclopentenal. Retro-iodolactonization with activated Zn, formation of the beta-lactone, and reduction of the aldehyde completed an efficient first synthesis of (+/-)-vibralactone. No protecting groups were used except for the novel use of an iodolactone to protect both the prenyl double bond and carboxylic
Vibralactone as a Tool to Study the Activity and Structure of the ClpP1P2 Complex from Listeria monocytogenes
作者:Evelyn Zeiler、Nathalie Braun、Thomas Böttcher、Andreas Kastenmüller、Sevil Weinkauf、Stephan A. Sieber
DOI:10.1002/anie.201104391
日期:2011.11.11
The Clp proteolytic machinery has important functions in many bacteria such as L. monocytogenes. Some organisms encode for two uncharacterized ClpP isoforms. Vibralactone was used to study the activity and assembly of ClpP1 and ClpP2 subunits in a hetero‐oligomeric complex. Electron microscopic images reveal that the tetradecameric assembly is made up of two stacked homoheptameric ClpP1 and ClpP2 rings