Radical cyclisation of sp(3) carbon-centred radicals onto imines and h
ydrazones provides a new method for the synthesis of 5- and 6-membered
ring nitrogen heterocycles. Cyclisation onto the electrophilic carbon
of the C=N group and 5-exo stereoelectronic selectivity are the domin
ating mechanistic parameters. The C-centred radical intermediates were
generated from benzeneselenyl precursors using Bu(3)SnH.