Transition metal-catalyzed chlorine transfer cyclizations of carbon-centered glycine radicals; A novel synthetic route to cyclic α-amino acids
作者:Jan H. Udding、C. (Kees) J.M. Tuijp、Henk Hiemstra、W. Nico Speckamp
DOI:10.1016/s0040-4020(01)80863-2
日期:1994.1
Copper(I)-catalyzed chlorine transfer radical cyclizations of several alpha-chloroglycine derivatives with a 3-alkenyl substituent at nitrogen are reported. These reactions proceed via 2-aza-5-alken-1-yl radicals as intermediates which bear electron-withdrawing carbonyl substituents at the radical center and at nitrogen. These radicals can be considered as relatively stable captodative radicals, which are easily generated in the presence of Cu(bpy)Cl, but are reactive enough for olefin cyclization. The main products usually arise from 5-exo cyclization and are structurally interesting analogues of proline. An X-ray crystal structure of one of the cyclization products is presented.