Sequencing of Three-Component Olefin Metatheses: Total Synthesis of Either (+)-Gigantecin or (+)-14-Deoxy-9-oxygigantecin
作者:Thomas R. Hoye、Brian M. Eklov、Junha Jeon、Mila Khoroosi
DOI:10.1021/ol061383u
日期:2006.7.1
(+)-14-deoxy-9-oxygigantecin (11). The skeleton of each compound is produced, at will, from the same precursors via a three-component ring-closing/cross-metathesis sequence that differs only in the ordering of the RCM vs CM events. Another notable aspect is the use of in situ epoxide-closing and -opening of iodohydrins with dimethylsulfonium methylide to provide inverted allylic alcohols.
[结构:见正文]通过合成(+)-gigantecin(1)及其构型异构体(+)-14-,证明了一种高效,灵活且高度收敛的策略,可用于获取含无乙酰乙酸原的跳过的双THF。脱氧-9-氧基甘加丁素(11)。每个化合物的骨架都是通过三组分闭环/交叉复分解序列从相同的前体中随意产生的,该序列仅在RCM与CM事件的顺序上有所不同。另一个值得注意的方面是使用碘甲烷与二甲基methyl甲基化物原位环氧化物封闭和打开碘醇以提供倒位的烯丙基醇。