Two new polypodane-type triterpenes, myrrhanol A and myrrhanone A, were isolated from the 50% aqueous methanolic extract of guggul-gum resin [the resin of Balsamodendron (=Commiphora) mukul HOOK.]. The structures of the new constituents, including their absolute configurations, were determined on the basis of chemical and physicochemical evidence.
Enantioselective Total Synthesis of the Potent Anti-inflammatory (+)-Myrrhanol A
作者:Victoriano Domingo、Lúcia Silva、Horacio R. Diéguez、Jesús F. Arteaga、José F. Quílez del Moral、Alejandro F. Barrero
DOI:10.1021/jo901011m
日期:2009.8.21
The first totalsynthesis of potentanti-inflammatory polypodanes (+)-myrrhanol A (1), (+)-myrrhanone A (2), (+)-myrrhanone B (3), and (+)-myrrhanol B (4) has been achieved. Key steps in our convergent, highly stereocontrolled route are a Ti(III)-mediated radical cyclization of a chiral monoepoxide to furnish a bicyclic synthon that combines stereospecifically with an acyclic vinyl iodide via an intermolecular