Total Synthesis of (+)-Bourgeanic Acid Utilizing <i>o</i>-DPPB-Directed Allylic Substitution
作者:Tomislav Reiss、Bernhard Breit
DOI:10.1021/ol9011635
日期:2009.8.6
The lichen metabolite (+)-bourgeanic acid has been synthesized utilizing a new strategy for the construction of propionate motifs relying on the o-DPPB-directed copper-mediated allylicsubstitution. This synthesis features the o-DPPB-directed allylicsubstitution employing a chiral Grignard reagent, Sharpless asymmetric epoxidation, and reductive epoxide ring opening with a higher order dimethylcuprate
Hierarchical Chiral Expression from the Nano- to Mesoscale in Synthetic Supramolecular Helical Fibers of a Nonamphiphilic <i>C</i><sub>3</sub>-Symmetrical π-Functional Molecule
作者:Ion Danila、François Riobé、Flavia Piron、Josep Puigmartí-Luis、John D. Wallis、Mathieu Linares、Hans Ågren、David Beljonne、David B. Amabilino、Narcis Avarvari
DOI:10.1021/ja202211k
日期:2011.6.1
properties in solution and in the solidstate of the enantiopure materials. Circular dichroism (CD) measurements show optical activity resulting from the presence of twisted stacks of preferential helicity and also reveal the critical importance of fiber nucleation in their formation. Molecular mechanics (MM) and molecular dynamics (MD) simulations combined with CD theoretical calculations demonstrate that