Subscribe to RSS
NHC-Catalyzed [4+2] Cycloaddition of Ketenes with N-Benzoyldiazenes
X.-L. Huang, L. He, P.-L. Shao, S. Ye*
institute of chemistry, Chinese Academy of Sciences, Beijing, P. R. of China
22 January 2009 (online)
Ye and co-workers report an enantioselective [4+2] cycloaddition of arylketenes with N-aryl-N -benzoyldiazenes or N,N-dibenzoyldiazenes catalyzed by N-heterocyclic carbenes. The enantioselectivity of the 1,3,4-oxadiazin-6-one 1 could be switched for most reactions by adjusting the substituents on the catalyst.