Total Synthesis of Neodysiherbaine A via 1,3-Dipolar Cycloaddition of a Chiral Nitrone Template
作者:Toshihiro Hirai、Kohki Shibata、Yohei Niwano、Masao Shiozaki、Yoshimitsu Hashimoto、Nobuyoshi Morita、Shintaro Ban、Osamu Tamura
DOI:10.1021/acs.orglett.7b03092
日期:2017.12.1
The total synthesis of neodysiherbaine A was achieved via 1,3-dipolar cycloaddition of a chiral nitrone template with a sugar-derived allyl alcohol in the presence of MgBr2·OEt2. This cycloaddition constructed the C2 and C4 asymmetric centers in a single step. Then reductive cleavage, intramolecular SN2 reaction of the tertiary alcohol, and oxidation of the primary alcohol afforded neodysiherbaine
在MgBr 2 ·OEt 2存在的情况下,通过将手性硝酮模板与糖衍生的烯丙醇进行1,3-偶极环加成反应,可以实现新西西拜因A的总合成。这种环加成反应可一步完成C2和C4不对称中心的构建。然后进行还原裂解,叔醇的分子内S N 2反应和伯醇的氧化,得到了新地西尔巴因A。