Synthesis of Phosphonobenzocarbacephems by Intramolecular Radical Cyclization of Haloaryl-Substituted β-Lactams
作者:Sarah Van der Jeught、Kurt G. R. Masschelein、Christian V. Stevens
DOI:10.1002/ejoc.200901351
日期:2010.3
A series of benzo-fused tricyclic β-lactams, most of them phosphonobenzocarbacephems, were prepared in a straightforward way starting from phosphonoazadienes. In this paper, the synthetic route including a Staudinger reaction towards the β-lactams, followed by radical ring closing with tributyltin hydride and AIBN, which resulted in the envisaged tricyclic compounds, is reported.
Double Nucleophilic 1,2-Addition of Silylated Dialkyl Phosphites to 4-Phosphono-1-aza-1,3-dienes: Synthesis of γ-Phosphono-α-aminobisphosphonates
作者:Kurt G. R. Masschelein、Christian V. Stevens
DOI:10.1021/jo701718t
日期:2007.11.1
[Graphics]gamma-Phosphono-alpha-aminobisphosphonates were synthesized from a new class of 4-phosphono-1-aza-1,3-dienes by the addition of dialkyl trimethylsilyl phosphites to these azadienes in the presence of acid. Depending on the steric demand of the group on nitrogen, double 1,2-addition or tandem 1,4-1,2-addition occurred.