Intramolecular 1,3-dipolar cycloaddition of cyclo-1,3-diene-tethered nitrile oxides
作者:Ming-Chang P. Yeh、Chi-Fen Jou、Wei-Tzou Yeh、Da-Yu Chiu、N. Ravi Kumar Reddy
DOI:10.1016/j.tet.2004.10.078
日期:2005.1
Intramolecular 1,3-dipolar cycloaddition of cyclo-1,3-diene- and -1,3,5-triene-tethered nitrile oxides gave tricyclic isoxazolines as a single stereoisomer in most cases. The relative stereochemistry of tricycle-fused isoxazolines resulting from 1,3-dipolar cycloaddition of cyclo-1,3-diene-tethered nitrile oxides is cis–cis, whereas from cyclohepta-1,3,5-triene-tethered nitrile oxides the cis–trans
在大多数情况下,环内1,3-二烯和-1,3,5-三烯系氮氧化物的分子内1,3-偶极环加成反应会生成三环异恶唑啉,作为单一的立体异构体。环-1,3-二烯系丁腈氧化物的1,3-偶极环加成反应产生的三环稠合异恶唑啉的相对立体化学是顺式–顺式,而环庚-1,3,5-三烯系丁腈氧化物则是顺式–顺式。 -反式异构体占主导地位。