Stereocontrolled preparation of tetrahydrofurans from acid-promoted rearrangements of allylic acetals
作者:Mark H. Hopkins、Larry E. Overman、Gilbert M. Rishton
DOI:10.1021/ja00014a030
日期:1991.7
tetrahydrofurans from readily available allylic diol and carbonyl components is reported. This synthesis is highly stereocontrolled and allows carbon side chains to be incorporated at each carbon. Enantiomerically pure tetrahydrofurans are readily prepared from chiral, nonracemic allylic diol precursors. The asymmetric synthesis of (+)-muscarine tosylate from the lactate-derived allylic diol 6a demonstrates that
报道了一种从容易获得的烯丙基二醇和羰基组分构建取代四氢呋喃的新方法。这种合成是高度立体控制的,并允许在每个碳上结合碳侧链。对映异构纯的四氢呋喃很容易从手性、非外消旋的烯丙二醇前体制备。从乳酸衍生的烯丙基二醇 6a 不对称合成 (+)-毒蕈碱甲苯磺酸酯表明,关键的重排步骤发生在同烯丙基立体中心的构型保留(方案 V)。来自 5R 缩酮 26b 的酰基四氢呋喃 (-)-27b 组装中光学活性的完全保留(方案 IV)与两步环化-频哪醇序列(方案 VII)发生的中心重排一致。