A novel halogen-radical-promoted dearomative aza-spirocyclization of alkynylimines
for the synthesis of 3-halo-spirocyclohexadienones is described. In this process,
it is believed that a radical addition, 5-exo-trig cyclization, and dearomative aza-spirocyclization are involved. Easily available
starting materials, mild conditions, and a wide substrate scope make this approach
potentially useful.
Key words
halogen radical - dearomative aza-spirocyclization - alkynylimine - 3-halo-spirocyclohexadienone
- 5-
exo-
trig cyclization