Synthesis of Enantiomerically Pure Dissymmetric 2,2'-Disubstituted9,9'-Spirobifluorenes
作者:Frank Thiemann、Torsten Piehler、Detlev Haase、Wolfgang Saak、Arne Lützen
DOI:10.1002/ejoc.200400796
日期:2005.5
Racemic dissymmetric 2,2'-dihydroxy-9,9'-spirobifluorene was prepared and resolved by clathrate formation with (R,R)-(+)-2,3-dimethoxy-N,N,N',N'-tetracyclohexylsuccindiamide, giving rise to both enantiomers in very good yields. The absolute stereochemistry of the resolved material could be assigned by an X-ray structure analysis of single crystals of the clathrate. Enantiomerically pure diols could
外消旋不对称 2,2'-二羟基-9,9'-螺二芴制备并通过与 (R,R)-(+)-2,3-二甲氧基-N,N,N',N'-四环己基琥珀二酰胺形成包合物进行拆分,以非常好的产率产生两种对映异构体。解析材料的绝对立体化学可以通过包合物单晶的 X 射线结构分析来确定。对映体纯二醇可以转化为相应的二三氟甲磺酸酯,然后在不同的交叉偶联程序中用作起始材料,以提供许多新的对映体纯螺环化合物,这些化合物带有适合进一步加工的多功能官能团,如一些例子所示。(© Wiley-VCH Verlag GmbH & Co. KGaA, 69451 Weinheim, Germany, 2005)