Desymmetrization of Cyclohexadienones via Intramolecular Stetter Reaction to Construct Tricyclic Carbocycles
摘要:
N-Heterocyclic carbene catalyzed desymmetrization of cyclohexadienones to construct tricyclic carbocycles via an intramolecular enantioselective Stetter reaction was realized. With 10 mol% of D-camphor-derived triazolium salt E and 10 mol% of KOAc, various substituted tricyclic carbocycles bearing a quaternary carbon stereogenic center and two contiguous stereocenters were obtained in excellent yields with up to 89% ee.
Copper‐Catalyzed Chemo‐ and Diastereoselective 1,3‐Dipolar Cycloaddition of Carbonyl Ylide and Aldehyde‐Tethered‐Cyclohexadienone to Access Polycyclic Systems
作者:Shiyong Peng、Hong Zhang、Yuqi Zhu、Ting Zhou、Jieyin He、Nuan Chen、Ming Lang、Hongguang Li、Jian Wang
DOI:10.1002/adsc.202100648
日期:2021.10.5
A copper-catalyzed tandem intermolecular ylide formation/intramolecular cycloaddition of diazo compounds and aldehyde-tethered-cyclohexadienones was reported, chemo- and diastereoselectively providing oxapolycyclic frameworks in moderate to excellent yields under mild conditions. This reaction creates two C−C bonds and one C−O bond with five stereocentres including two all-carbon quaternary centres