Synthetic Studies on (+)-Ophiobolin A: Asymmetric Synthesis of the Spirocyclic CD-Ring Moiety
作者:Naoyoshi Noguchi、Masahisa Nakada
DOI:10.1021/ol060437x
日期:2006.5.1
Asymmetric synthesis of the spirocyclic CID-ring moiety of (+)-ophiobolin A is described. Fragment A, which was prepared via pig liver esterase (PLE)-mediated kinetic resolution, and fragment B, which was prepared via diastereoselective allylation and subsequent kinetic iodolactonization, were coupled to afford the allylsilane 2, which was successfully cyclized to the desired spirocyclic CD-ring moiety la in the presence of a Lewis acid.