A new approach to the synthesis of 1-oxaspiro[4.n]alkanes and tetrahydrofurans by the 1,5-CH insertion reaction of magnesium carbenoids
作者:Tsuyoshi Satoh、Tsukasa Yasoshima、Hitoshi Momochi
DOI:10.1016/j.tetlet.2012.02.034
日期:2012.4
in high to quantitative yields via the 1,5-CH insertion reaction of generated magnesium carbenoid intermediates. When this procedure was commenced with acyclic ketones, multi-substituted tetrahydrofurans were obtained in up to a 96% yield. This procedure provides a new and good way for the synthesis of 1-oxaspiro[4.n]alkanes and tetrahydrofurans with the formation of a carbon–carbon bond between a carbenoid
由各种环状酮以良好的总收率制备了1-烷氧基-1- [2-氯-2-(对甲苯基亚磺酰基)乙基]环烷烃。用i处理这些带有亚硫酰基的环烷烃-PrMgCl通过生成的镁类马鞭草中间体的1,5-CH插入反应,以高至定量的产率形成了1-oxaspiro [4.n]烷烃。当从无环酮开始该程序时,以高达96%的收率获得了多取代的四氢呋喃。该方法为合成1-oxaspiro [4.n]烷烃和四氢呋喃提供了一种新的良好方法,该方法可以高产率地在类胡萝卜素碳和非活性碳之间形成碳-碳键。事实证明,镁类胡萝卜素中间体中的氧原子在1,5-CH插入反应中起着非常重要的作用。