Cyclization of alkenyl radicals in 5- and 6-(pi-Exo)-exo-dig modes: new entry to exo-cyclic dienes
Radical cyclizations of alkenyl iodides in both 5- and 6-(pi-exo)-exo-dig modes were effected by tributyltin hydride and AIBN to give exo-cyclic dienes fused to five- and six-membered rings in good yields.
Sha
CK
Department of Chemistry, National Tsing Hua University, Hsinchu 300, Taiwan, Republic of China.
Zhan
ZP
Wang
FS