derivative had to be employed for this reaction since a glucal derivative failed to work. This synthesis complements our previously described preparation of the corresponding cis isomers by the same methodology. Thus, convenient access has become available to all four homochiral stereoisomers of α-hydroxy-β-lactams some of which are synthons for Taxol® and analogs.
通过
碘催化的费雷尔重排的立体特异性糖基化已用于获得反式4-芳基-3-羟基-
2-氮杂环丁酮的两种对映体。出乎意料的是,由于
葡糖衍
生物不能起作用,因此必须将
鼠李糖衍
生物用于该反应。该合成通过相同的方法补充了我们先前描述的相应顺式异构体的制备。因此,方便地访问已经变得可用到的所有四个纯手性的立体异构体α羟基β内酰胺其中一些是对
紫杉醇的合成子®和类似物。