Diastereoselective Synthesis of Novel Spiro-Isoxazolidines via [3 + 2] Cycloaddition
作者:Sakshi Shah、Rahul Badru、Baldev Singh
DOI:10.1080/00397911.2011.622063
日期:2013.3.1
Abstract In this protocol, synthesis of novel 2,5-diphenyl-3,3-spiropentamethylene-5H-2,3,3a,6a-tetrahydropyrrolo[3,4-d]isoxazole-4,6-diones through [3 + 2] cycloaddition of N-cyclohexylidene N-phenyl nitrones with cyclic dipolarophiles is described. 1,3-Dipolar cycloaddition of nitrones with substituted N-arylmaleimides gives exclusively endo-diastereoisomers of spiro-isoxazolidines and their stereochemistry
摘要 在该协议中,通过 [3 + 2 合成新型 2,5-二苯基-3,3-螺环戊亚甲基-5H-2,3,3a,6a-四氢吡咯并[3,4-d]异恶唑-4,6-二酮] 描述了 N-亚环己基 N-苯基硝酮与环状亲偶极体的环加成反应。硝酮与取代的 N-芳基马来酰亚胺的 1,3-偶极环加成反应仅产生螺-异恶唑烷的内非对映异构体,并使用 1H NMR 和 1H-1H 相关光谱研究指定它们的立体化学。图形概要