Synthesis of tetracyclic pyrrolidine/isoxazolidine fused pyrano[3,2-h]quinolines via intramolecular 1,3-dipolar cycloaddition in ionic liquid
作者:Abhijit Hazra、Yogesh P. Bharitkar、Arindam Maity、Shyamal Mondal、Nirup B. Mondal
DOI:10.1016/j.tetlet.2013.06.029
日期:2013.8
Tetracyclic pyrrolidine/isoxazolidine fused pyrano[3,2-h]quinolines were synthesized via intramolecular 1,3-dipolar cycloaddition in ionic liquid. The transformations are operationally simple and environment-friendly in nature. The reaction is highly stereoselective affording exclusively the cis fused products, as deduced by the small coupling constant value (J = 4.8 Hz) between ring juncture protons
通过分子内1,3-偶极环加成反应在离子液体中合成四环吡咯烷/异恶唑烷稠合的吡喃并[3,2- h ]喹啉。转换本质上是操作简单且环境友好的。该反应是高度立体选择性的,仅由顺式稠合产物提供,这是由 环结质子之间的较小偶合常数值(J = 4.8 Hz)推导的,该偶合常数也显示出清晰的NOESY相关性(在5a和5c中)。证实性证据来自5d的单晶X射线晶体学。