Asymmetric<i>syn</i>-Dihydroxylation of β-Substituted (2<i>R</i>)-<i>N</i>-(α,β-Enoyl)bornane-10,2-sultams
作者:Jerzy Raczko、Michael Achmatowicz、Artur Jezewski、Christian Chapuis、Zofia Urbañczyk-Lipkowska、Janusz Jurczak
DOI:10.1002/hlca.19980810537
日期:——
β-substituted (2R)-N-[(E)-α,β-enoyl]bornane-10,2-sultams were oxidized with OsO4/4-methylmorpholine 4-oxide in a highly stereoselective manner. In all cases, the attack occurred on the C(α)-re face. The absolute configurations of all products were determined by chemical correlation. Mechanistic considerations about the reactive conformation as well as fully refined X-ray crystal structures of the dihydroxylated
以高度立体选择性的方式,用OsO 4 / 4-甲基吗啉4-氧化物氧化各种β-取代的(2 R)-N -[(E)-α,β-烯酰基]硼烷-10,2-sultams 。在任何情况下,袭击发生在C(α) -重新面对。所有产品的绝对构型由化学相关性确定。讨论了有关二羟基化产物的反应构象以及完全精制的X射线晶体结构的力学考虑。还介绍了适用于紫杉醇和Taxotere®C(13)侧链以及Cardizem®和氯霉素前体制备的新的磺酰化中性条件。