Unexpected ring contraction of 1-aryl-cyclohexa-2,5-dienes under palladium catalysis
作者:Raphaël Lebeuf、Frédéric Robert、Yannick Landais
DOI:10.3998/ark.5550190.p008.241
日期:——
of 1,1-disubstituted cyclohexa-2,5-dienes with aryl iodides in the presence of Pd(0) unexpectedly provided bicyclo[3.1.0] compounds in a very diastereocontrolled fashion in moderate to good yield. A tentative mechanism is proposed to rationalize this unusual reactivity of cyclohexadienes underpalladiumcatalysis.
Palladium-Catalyzed Enantioselective Desymmetrizing Aza-Wacker Reaction: Development and Application to the Total Synthesis of (−)-Mesembrane and (+)-Crinane
作者:Xu Bao、Qian Wang、Jieping Zhu
DOI:10.1002/anie.201712521
日期:2018.2.12
good yields with excellent enantioselectivities. A cooperative effect between the phosphoric acid and the pyrox ligand ensured efficient transformation. This reaction was tailor‐made for Amaryllidaceae and Sceletium alkaloids as illustrated by its application in the development of the concise and divergenttotalsynthesis of (−)‐mesembrane and (+)‐crinane.