Phosphane-Catalyzed [4+1] Annulation between Nitroalkenes and Morita-Baylis-Hillman Carbonates: Facile Synthesis of Isoxazoline<i>N</i>-Oxides by Phosphorus Ylides
作者:Rong Zhou、Chong Duan、Changjiang Yang、Zhengjie He
DOI:10.1002/asia.201301633
日期:2014.4
A phosphane‐catalyzed [4+1] annulation between nitroalkenes and Morita–Baylis–Hillman carbonates has been realized; this provides facile and diastereoselective access to polysubstituted isoxazoline N‐oxides in moderate to excellent yields. In the annulation, an in situ formed allylic phosphorus ylide presumably serves as a pivotal active intermediate. This reaction accordingly represents the first
已经实现了膦催化的硝基烯烃与Morita–Baylis–Hillman碳酸盐之间的[4 + 1]环化;这提供了以中等到优异的收率轻松和非对映选择性地获得多取代的异恶唑啉N-氧化物的方法。在成环过程中,原位形成的烯丙基磷叶立德被认为是关键的活性中间体。因此,该反应代表了由磷叶立德引发的硝基烯烃的[4 + 1]环化反应生成异恶唑啉N-氧化物的第一个例子。