Page 1. Tetrahedron Letters. Vol. 33, No. 34. pp. 4993-4994.1992 Printed in Great Britain 0@40-4039/92 $5.00 + .OO Perganllm Ress Ltd Cyclisation of Aminyl Radicals using Sulfenamide Precursors W. Russell Bowman*, David N. Clark, and Robert J. Marmon ...