The intramolecular chemistry of benzyl and phenethyl azidoformates
作者:Otto Meth-Cohn、Dalpat Patel、Salah Rhouati
DOI:10.1016/s0040-4039(00)85579-3
日期:1982.1
Benzyl azidoformates yield one of a variety of products on spray pyrolysis dependent upon substitution, including oxazoloazepines, their syn or anti [6 + 4] dimers, their [6 + 6] dimers, a benzoxazinone or an aryl isocyanate; the phenethyl analogues give stable oxazinoazepines.
An asymmetric transfer hydrogenation of 2-oxazolones in the presence of a chiral diamine ruthenium catalyst with potassium formate as a hydrogen source and potassium carbonate as an additive in 2,2,2-trifluoroethanol is described. A series of chiral 2-oxazolidinones were obtained with 29%–95% yields and 86%–>99% ee's. Furthermore, gram-scale synthesis of chiral 2-oxazolidinone and its downstream derivatizations