Racemic 3-cyclohexyl-1-methyldiaziridine was found to react with α,β-unsaturated amides in basic conditions, giving N-unprotected trans-aziridines, while 3,3-pentamethylenediaziridine had been reported to afford cis-aziridines in high diastereoselectivity. The trans-selectivity was partially dependent on the stereochemistry of the substrate. The stereochemistries of these reactions were reasonably explained by the conformational analysis of the intermediary enolates.
外消旋的 3-环己基-1-甲基二
氮丙啶被发现在碱性条件下与 α,β-不饱和酰胺反应,得到 N-未保护的反式
氮丙啶,而 3,3-五亚甲基二
氮丙啶据报道以高非对映选择性提供顺式
氮丙啶。反式选择性部分取决于底物的立体
化学。这些反应的立体
化学通过中间烯醇化物的构象分析得到了合理的解释。