New chiral P-ligands: P-amino- and P-cycloalkoxy dibenzo[c.e][1,2]oxaphosphorines
作者:György Keglevich、Helga Szelke、Andrea Kerényi、Veronika Kudar、Miklós Hanusz、Kálmán Simon、Tímea Imre、Krisztina Ludányi
DOI:10.1016/j.tetasy.2005.11.006
日期:2005.12
phosphonous derivatives. The isomers were separated in a diastereomeric excess of 71–93% at the phosphonic oxide and/or at the phosphonous borane stage. The P(III) boranes are suitable precursors of the P-ligands. The absolute P-configuration in one of the menthyl phosphonates isolated was determined by single crystal X-ray analysis.
外消旋氯二苯并[ c]的反应。e ] [1,2]氧杂膦与(S)-(-)-α-甲基-苄基胺和(1 R,2 S,5 R)-(-)-薄荷醇形成相应的光学活性非对映异构体的混合物亚膦酸酯衍生物。在氧化膦和/或磷化硼烷阶段,异构体以非对映体过量的形式分离(71-93%)。P(III)硼烷是P-配体的合适前体。通过单晶X射线分析确定分离的薄荷基膦酸酯之一中的绝对P-构型。