[reaction: see text] The enantiomers of spiro[4.4]nonane-1,6-diol have been transformed by different reaction pathways into the two possible carbaspironucleoside epimers with natural C1' absolute stereochemistry.
[反应:见正文]螺[4.4]
壬烷-1,6
-二醇的对映异构体已通过不同的反应途径转化为两种可能的具有天然C1'绝对立体
化学的碳螺螺核苷差向异构体。