title: New protocols for the assembly of the tetracyclic framework associated with the aromatic erythrina alkaloids.
abstract: [reaction: see text] Treatment of the anion derived from the ring-fused gem-dichlorocyclopropane 4c with silver tetrafluoroborate afforded the spirocyclic compound 17 in 74% yield. Product 17 was readily converted, over three steps, into the beta-iodoethyl derivative 20 and treatment of this latter compound with n-Bu(3)SnH then afforded, in 93% yield and via a radical addition/elimination sequence, compound 2 incorporating the ABCD framework of the aromatic erythrina alkaloids.
authors: Research School of Chemistry, Institute of Advanced Studies, The Australian National University, Canberra.
authors: Pauline C
authors: PC
authors: Stanislawski
authors: Anthony C
authors: AC
authors: Willis
authors: Martin G
authors: MG
authors: Banwell