An unexpected N-heterocyclic carbene-catalyzed annulation of enals and nitroso compounds.
The N-heterocyclic carbene (NHC)-catalyzed annulation of enals with nitroso compounds in the presence of DBU in THF has been described. Unexpected seven-membered 4-azalactones were formed according to a process involving a 1,2-Bamberger-type rearrangement.
Yang
Limin
L
Division of Chemistry and Biological Chemistry, School of Physical & Mathematical Sciences, Nanyang Technological University, Singapore 637371, Singapore.
Tan
Bin
B
Wang
Fei
F
Zhong
Guofu
G