A Short Enantioselective Total Synthesis of (−)-Englerin A
作者:Martin Zahel、Anton Keßberg、Peter Metz
DOI:10.1002/anie.201301247
日期:2013.5.10
Synthesis of the Guaianolide Ring System via Cycloaddition of a Bicyclic Carbonyl Ylide with Allyl Propiolate
作者:Vaidotas Navickas、Dmitry B. Ushakov、Martin E. Maier、Markus Ströbele、H.-Jürgen Meyer
DOI:10.1021/ol1012185
日期:2010.8.6
trans-annulated cyclopentane ring was generated by a Rh2(OAc)4-catalyzed reaction from a diazoketone precursor and trapped with allyl propiolate. The 1,3-dipolar cycloaddition led to the stereoselective formation of an oxygen-bridged polycycle. Via Curtius degradation, the cycloadduct was transformed to the ring skeleton typical of the sesquiterpene family of guaianolides.