Efficient and stereoselective one-pot synthesis of benzo[<i>b</i>]oxazolo[3,4-<i>d</i>][1,4]oxazin-1-ones
作者:Hongyi Zhao、Wenting Zhao、Shihao Cheng、Haijia Lu、Dongfeng Zhang、Haihong Huang
DOI:10.1039/d0ra04104a
日期:——
An efficient and mild one-pot convergent synthesis protocol has been developed for benzo[b]oxazolo[3,4-d][1,4]oxazin-1-one derivatives through the Mitsunobu reaction and sequential cyclization. Various tricyclic fused benzoxazinyl-oxazolidinones (20 examples) were obtained in good to excellent yields and high enantioselectivities with facile operation. Furthermore, four stereoisomers were afforded
通过 Mitsunobu 反应和顺序环化,为苯并[ b ]恶唑并[3,4- d ][1,4]oxazin-1-one 衍生物开发了一种高效温和的一锅聚合合成方案。各种三环稠合苯并恶嗪基-恶唑烷酮(20 个实例)以良好至优异的收率和高对映选择性且操作简便获得。此外,通过使用不同的手性 2,3-epoxy-4-trityloxybutanol ,四种立体异构体分别具有高 ee 值(>97.8%) 。该方法已应用于候选药物关键中间体的合成。