[3 + 3] Formal Cycloadditions of Nitrones from Isatins and Azaoxyallyl Cations for Construction of Spirooxindoles
作者:Weijia Lin、Gu Zhan、Minglin Shi、Wei Du、Yingchun Chen
DOI:10.1002/cjoc.201600864
日期:2017.6
A [3 + 3] formal cycloaddition reaction between in situ formed azaoxyallyl cations and nitrones from isatins has been developed, furnishing a spectrum of spiro[1,2,4‐oxadiazinan‐5‐one]oxindoles in good to excellent yields with excellent diastereoselectivity. This method provides direct and efficient access to potentially bioactive spirooxindoles incorporating a six‐membered heterocyclic scaffold.
已经开发出[3 + 3]形式的原位形成的氮杂烯丙基烯丙基阳离子与靛红中的硝酮之间的正式环加成反应,从而提供了螺[1,2,4-氧杂二嗪-5-5]吲哚的光谱,其收率高至优异,具有非对映选择性。这种方法可直接有效地利用含有六元杂环支架的潜在具有生物活性的螺硫醇。