Facile synthesis of tricyclic isoxazole-fused benzo[b]thiophene 1,1-dioxide derivatives via 1,3-dipolar cycloaddition
作者:Kai-Kai Wang、Yan-Li Li、Wei Zhang、Shan-Shan Zhang、Ting-Ting Qiu、Xueji Ma
DOI:10.1016/j.tetlet.2020.151943
日期:2020.6
A facile and efficient [3 + 2] 1,3-dipolar cycloaddition reaction of nitrile oxides generated in situ from hydroximoyl chlorides with benzo[b]thiophene 1,1-dioxides has been achieved for rapid access to tricyclic isoxazole-fused benzo[b]thiophene 1,1-dioxide derivatives in excellent yields (up to 98%) with high diastereoselectivities (dr > 19:1). The present process is characterized by mild reaction
快速,快速地获得三环异恶唑稠合的苯并[ b ]的便捷,有效的[3 + 2] 1,3-偶极环加成反应是由羟肟基氯与苯并[ b ]噻吩1,1-二氧化物生成的。]噻吩1,1-二氧化物衍生物,具有极高的非对映选择性(dr> 19:1),产率高(高达98%)。本方法的特征在于温和的反应条件和广泛的底物范围。还已经实现了环加合物向其他有用结构的转化。通过X射线单晶结构分析确认了典型化合物的化学结构。