Synthesis of (−)-auricularic acid and its C-4 epimer the absolute configuration of auricularic acid
作者:Antonio Abad、Manuel Arnó、Miguel Peiró、Ramon J. Zaragozá
DOI:10.1016/s0040-4020(01)80907-8
日期:——
A synthesis of (−)-auricularic acid (2a) starting from methyl (+)-13-oxo- podocarp-8(14)-en-19-oate (3a) and a synthesis of its C-4 epimer (2b) starting from methyl (+)-13-oxopodocarp-8(14)-en-18-oate (3b) are described. The absoluteconfiguration of natural auricularic acid is stablished as (4R, 5S, 8S, 9R, 10S, 14S).
Semisynthesis of the Antiviral Abietane Diterpenoid Jiadifenoic Acid C from Callitrisic Acid (4-Epidehydroabietic Acid) Isolated from Sandarac Resin
作者:Miguel A. González、Ramón J. Zaragozá
DOI:10.1021/np500569y
日期:2014.9.26
diterpenoid (+)-jiadifenoic acid C starting from the available methyl ester of callitrisic acid (4-epidehydroabietic acid) isolated from sandaracresin is reported. A protocol for the isolation of methyl callitrisate (methyl 4-epidehydroabietate) in gram quantities from sandaracresin is also described. Allylic C-17 oxygenation was introduced by regioselective dehydrogenation of the isopropyl group of methyl
The synthesis of diverse trans-fused decalins, including the abietane diterpenoids scaffold, using an efficient selective oxidation strategy is described. The abietane core was demonstrated to be a versatile scaffold that can be site-selectively functionalized. The utility of this novel oxidation strategy was showcased in a concise totalsynthesis of six abietane congeners.