A convenient lactonization of diols to γ- and δ-lactones catalysed by transition metal polyhydrides
摘要:
Transition metal polyhydrides-catalyzed oxidative condensation of diols to 5 and 6-ring lactones was studied. The regioselective dehydrogenation of unsymmetrically substituted 1,4-diols gave beta- or gamma-substituted gamma-lactones in high yields. The mechanism of dehydrogenation under neutral and mild conditions was discussed.