Synthesis, X-ray structures and chemistry of enantiomerically pure 10,11-dihydro-5-phenyl-5H-dibenzo[b,f ]phosphepine 5-oxides
作者:Paul Wyatt、Stuart Warren、Mary McPartlin、Tom Woodroffe
DOI:10.1039/b006883g
日期:——
Several phosphepine oxides were synthesised in optically pure form. Sharpless asymmetric dihydroxylation was used to introduce the chiral centres in all cases. Ring closure was achieved using either PhPCl2 or PrPCl2 together with a double nucleophile generated by either a double ortho-lithiation or double bromineâlithium exchange. The X-ray crystal structures of three phosphepine oxides illustrate their different conformations. The NMR spectra of several phosphepine oxides are described as is the chemistry which is shown to differ from that of acyclic phosphine oxides.
几种磷啶氧化物以光学纯度合成。所有情况下均使用Sharpless不对称二羟基化法引入手性中心。环的闭合是通过使用PhPCl₂或PrPCl₂以及由双正位锂化或双溴-锂交换生成的双亲核体来实现的。三种磷啶氧化物的X射线晶体结构展示了它们不同的构象。几种磷啶氧化物的核磁共振光谱被描述,其化学特性显示出与线性磷氧化物的不同。