Study of the Effect Induced by the Substituents on the Ring−Chain Tautomerism of Schiff Bases Derived from Norephedrine
作者:Daniel Talancón、Ramon Bosque、Concepción López
DOI:10.1021/jo100255k
日期:2010.5.21
the novel Schiff bases (1S,2R)-R1CH═NCH(Me)CH(OH)Ph [with R1 = ferrocenyl-[Fc (2b)], 5- or 3-methylthienyl [hereafter referred to as 5-MeTf and 3-MeTf (2c and 2d), respectively]] are reported. NMR studies show the existence of a tautomeric equilibrium between these imine forms (2b−d) and 2-substituted 4-methyl-5-phenyloxazolidines. The comparison of the results reveals that the molar ratios imine/oxazolidines