A Relay Strategy Actuates Pre-Existing Trisubstituted Olefins in Monoterpenoids for Cross-Metathesis with Trisubstituted Alkenes
作者:Karim A. Bahou、D. Christopher Braddock、Adam G. Meyer、G. Paul Savage、Zhensheng Shi、Tianyou He
DOI:10.1021/acs.joc.0c00067
日期:2020.4.3
benzylidene catalyzed olefincross-metathesis with homoprenyl benzenes. Successful implementation of this approach provided several epoxypolyenes as expected (E/Z, ca. 2-3:1). The method is further generalized for the cross-metathesis of pre-existing trisubstituted olefins in other relay-actuated Δ6,7-functionalized monoterpenoid alcohols with various other trisubstituted alkenes to form new trisubstituted
Synthesis of<i>ent</i>-Kaurane and Beyerane Diterpenoids by Controlled Fragmentations of Overbred Intermediates
作者:Emily C. Cherney、Jason C. Green、Phil S. Baran
DOI:10.1002/anie.201304609
日期:2013.8.19
polyene cyclization precursor designed to directly yield oxidation at the axial C19‐methyl group. Construction of the [3.2.1]bicyclicsystem found in the ent‐kaurane skeleton was realized with two overbred intermediates. Wagner–Meerwein rearrangement of the [3.2.1]bicyclicsystem yields the beyerane skeleton of isosteviol.