Effect of Temperature of 5-Endo- and 4-Exo-Trig Radical Cyclizations of N-Vinylic α-Halo Amides
作者:Hiroyuki Ishibashi、Masahiro Higuchi、Masashi Ohba、Masazumi Ikeda
DOI:10.1016/s0040-4039(97)10492-0
日期:1998.1
The radical 3a generated from N-vinylic trichloroacetamide la provided the 5-endo-trig cyclization product 2a in boiling toluene, whereas, at room temperature, gave the 4-exo-trig cyclization product 9. The results may be explained in terms of the reversibility of 4-exo cyclization. (C) 1997 Elsevier Science Ltd. All rights reserved.