A synthetic approach towards halichlorine using a N-bromosuccinimide-promoted ring expansion reaction as the key step

ORGN 91

Gregory R Dake and Paul B Hurley. Department of Chemistry, Univerisity of British Columbia, 2036 Main Mall, Vancouver, BC V6T 1Z1, Canada
Halichlorine is a naturally occurring alkaloid that exhibits an interesting 6-5 aza-spirocyclic moiety. We have targeted tricycle A as a potential intermediate in the total synthesis of this molecule. We plan to establish the key stereocenter adjacent to the nitrogen atom of A by using NBS-ring expansion methodology developed in our laboratories.