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
A Short Diastereoselective Total Synthesis of (±)-Vibralactone
作者:Alexander J. Leeder、Robert J. Heap、Lynda J. Brown、Xavier Franck、Richard C. D. Brown
DOI:10.1021/acs.orglett.6b03007
日期:2016.12.2
A total synthesis of the (±)-vibralactone has been achieved in 11 steps and 16% overall yield from malonic acid. Key steps include a highly diastereoselective allylation of an α-formyl ester containing an all carbon α-quaternary center, a Pd-catalyzed deallylative β-lactonization, and an aldehyde-selective Wacker oxidation of a terminal alkene.
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
作者:Sepand K. Nistanaki、Luke A. Boralsky、Roy D. Pan、Hosea M. Nelson
DOI:10.1002/anie.201812711
日期:2019.2.4
Disclosed is a five-step synthesis of (±)-vibralactone, a biologically active terpenoid natural product. A key photochemical valence isomerization of 3-prenyl-pyran-2-one produces both the all-carbon quaternary stereocenter and the β-lactone at an early stage. Cyclopropanation of the resulting bicyclic β-lactone produces a strained housane structure that is converted to the natural product through