The construction of a chiral building block with a quaternary carbon center is described, based on the Lewis acid-catalyzedacylmigration of α,β-epoxy ketone with alkyl and alkenyl substituents.
Convergent Enantioselective Synthesis of the Tricyclic Core of Phomactin A
作者:Peter J. Mohr、Randall L. Halcomb
DOI:10.1021/ol026159t
日期:2002.7.1
[GRAPHICS]The tricyclic core of phomactin A was synthesized from 6,6-dimethyl-2-cyclohexen-1-one. Key reactions include the addition of a cyclohexenyllithium reagent to an epoxyaldehyde and a regioselective intramolecular epoxide opening to install the oxadecalin core.
IspG Converts an Epoxide Substrate Analogue to (<i>E</i>)-4-Hydroxy-3-methylbut-2-enyl Diphosphate: Implications for IspG Catalysis in Isoprenoid Biosynthesis
作者:Rodney L. Nyland II、Youli Xiao、Pinghua Liu、Caren L. Freel Meyers
DOI:10.1021/ja907470n
日期:2009.12.16
IspG is an intriguing enzyme in bacteria, parasite, and plant isoprenoid biosynthesis, and its catalytic mechanism remains elusive. We report here the synthesis of (2R,3R)-4-hydroxy-3-methyl-2,3-epoxybutanyl diphosphate (Epoxy-HMBPP), a proposed intermediate in one of the frequently cited mechanistic models. We have also demonstrated that this epoxide analogue is a catalytically competent IspG substrate. This study represents the first mechanistic study of this important enzyme.
Concise Synthesis of (+)-2-<i>C</i>-Methyl-<scp>d</scp>-erythritol-4-phosphate