Copper Carbenoid, Reactant and Catalyst for One-Pot Diazo Ester Coupling Cascade Rearrangement of Enediynes: Formation of Two Contiguous Tetrasubstituted Stereocenters
作者:Shovan Mondal、Malek Nechab、Damien Campolo、Nicolas Vanthuyne、Michèle P. Bertrand
DOI:10.1002/adsc.201200045
日期:2012.7.9
The copper‐catalyzed reaction of enediynes with diazoesters leads to cyclic amino esters bearing twocontiguoustetrasubstituted stereogenic centers through a one‐pot, five‐step cascade. Copper iodide catalyzes the formation of an intermediate 3‐alkynoate and coppercarbenoid promotes its reversible isomerization to the corresponding allenoate. The alkynoate‐allenoate equilibrium is completely shifted
Cooperative Use of VCD and XRD for the Determination of Tetrahydrobenzoisoquinolines Absolute Configuration: A Reliable Proof of Memory of Chirality and Retention of Configuration in Enediyne Rearrangements
作者:Shovan Mondal、Jean-Valère Naubron、Damien Campolo、Michel Giorgi、Michéle P. Bertrand、Malek Nechab
DOI:10.1002/chir.22221
日期:2013.12
absolute configurations (AC) of azaheterocylic compounds resulting from the cascade rearrangement of enediynes involving only light atoms were unambiguously assigned by the joint use of vibrational circular dichroism (VCD) and copper radiation single crystal X‐ray diffraction (XRD). These AC determinations proved that the rearrangements of enediynes proceeded with memory of chirality and retention of configuration