Cyclofunctionalisation reactions of epoxyalcohol derivatives. 3. cyclisationacyl migration of n-benzoylcarbamates to stereodefined oxazolidinones. A new, diastereospecific route to thiamphenicol.
作者:S.W. McCombie、T.L. Nagabhushan
DOI:10.1016/s0040-4039(00)96737-6
日期:1987.1
N-Benzoylcarbamates formed from 2,3-epoxyalcohols and PhCONCO undergo clean N to C-2 cyclisation followed by N to Oacylmigration on treatment with catalytic sodium imidazolide or other bases. Subsequent benzoate cleavage (NaOMe) is accompanied by equilibration of the N-unsubstituted oxazolidinones; cleavage without significant isomerisation is achieved with MeLi or Zn(BH4)2. This methodology is applied