Synthesis and stereochemistry of some dispiro-1,3-dioxanes with axial and helical chirality
作者:Ion Grosu、Sorin Mager、Gerard Plé、Eugen Mesaros
DOI:10.1016/0040-4020(96)00760-0
日期:1996.9
The stereoisomerism of some dispiro-1,3-dioxanes is discussed in terms of conformational analysis and axial and helical chirality. The influence of the flexibility of the rings on the representative number of isomers and on their NMR spectra is commented. For the 3,12-disubstituted-1,5,10,14-teraoxadispiro[5.2.5.2]hexadecane derivatives displaying a semiflexible structure two configurational diastereomers
从构象分析以及轴向和螺旋手性方面讨论了一些dispiro-1,3-dioxanes的立体异构。评述了环的挠性对异构体的代表性数目及其NMR光谱的影响。对于显示半柔性结构的3,12-二取代的1,5,10,14-四恶二螺[5.2.5.2]十六烷衍生物,两种构型的非对映异构体分别为“ 6,9-dispiro-syn”和“ 6,9-dispiro-anti” ”。这些异构体之间的比例由质子和碳原子的非对映异构性决定。