A new method for the asymmetric Diels-Alderreaction between furan and acrolein has been developed through the combined use of chiral organocatalysts and highpressure (yield up to 91%; endo-adduct up to 19% ee, exo-adduct up to 26% ee).
Rhodium-Catalyzed Asymmetric Cycloisomerization and Parallel Kinetic Resolution of Racemic Oxabicycles
作者:Charles C. J. Loh、Matthias Schmid、Robert Webster、Andy Yen、Shabnam K. Yazdi、Patrick T. Franke、Mark Lautens
DOI:10.1002/anie.201604937
日期:2016.8.16
variant is unknown. Reported herein is the first rhodium‐catalyzed asymmetric cycloisomerization of meso‐oxabicyclic alkenes tethered to bridgehead nucleophiles, thus providing access to tricyclic scaffolds through a myriad of enantioselective C−O, C−N, and C−C bond formations. Moreover, we also demonstrate a unique parallel kineticresolution, whereby racemic oxabicycles bearing two different bridgehead