作者:W. Abraham、Y. Roeske
DOI:10.1055/s-2001-15054
日期:——
0039-7881 Abstract: Stereoselective cycloaddition of aroylnitrenes, generated by photolysis of the corresponding azides 2a,b with the racemic mixtures of cyclic enol ethers 5b and 5c was achieved with the formation of oxazolines 8. Both the chiral auxiliary attached to the aroylnitrene and the substituent in the substrate is necessary in order to selectively allow the formation of the trans-adducts
Synthesis 2001, No. 8, 18 06 2001。文章标识符:1437-210X,E;2001,0,08,1125,1132,ftx,en;C00501SS.pdf。© Georg Thieme Verlag Stuttgart · 纽约 ISSN 0039-7881 摘要:通过光解相应的叠氮化物 2a,b 与环状烯醇醚 5b 和 5c 的外消旋混合物产生的芳酰基氮烯的立体选择性环加成反应形成恶唑啉 8。为了选择性地形成反式加合物 8 ,与芳酰基氮烯和底物中的取代基相连的手性助剂是必要的。带有手性助剂的芳酰基氮烯与酮的环加成反应不会发生立体选择性。发现带有相邻酰胺基的苯甲酰叠氮化物通过分子内插入 N-H 键发生意外反应。