The α-hydroxyphosphonate-phosphate rearrangement of a noncyclic substrate – some new observations
作者:Susanne Prechelmacher、Kurt Mereiter、Friedrich Hammerschmidt
DOI:10.1039/c8ob00419f
日期:——
5(10)-estratrien-17-one delivered two epimeric phosphonates separated by HPLC. Methylation with methyl fluorosulfate at the sulfur atom and treatment with a strong base induced an α-hydroxyphosphonate-phosphate rearrangement with formation of dimethyl sulphide and two enantiomerically pure enol phosphates. Their oily nature interfered with a single crystal X-ray structure analysis to determine the stereochemistry at
用(R)-1-苯基乙胺拆分外消旋的乙基氢(1-羟基-2-甲基硫烷基-1-苯基乙基)膦酸酯。(-)-对映异构体的(R)-构型通过化学相关性确定。用衍生自3-羟基-1,3,5(10)-雌三烯-17-的取代的重氮甲烷对(-)-对映异构体进行酯化反应,得到了两种HPLC分离的差向异构膦酸酯。在硫原子上用氟代硫酸甲酯进行甲基化并用强碱处理会引起α-羟基膦酸酯-磷酸盐重排,形成二甲基硫醚和两种对映体纯的烯醇式磷酸酯。它们的油性干扰了单晶X射线结构分析,从而确定了磷原子的立体化学。