X=Y–ZH Systems as potential 1,3-dipoles. Part 52: Fused-ring forming electrophile induced oxime→nitrone→cycloaddition cascades
作者:H Ali Dondas、Ronald Grigg、Sylvie Thibault
DOI:10.1016/s0040-4020(01)00661-5
日期:2001.8
Electrophile induced cyclisation of oximes onto endocyclic alkenes and exo-methylene cycloalkanes occurs stereo- and regio-specifically generating cis-fused bicyclic nitrones in good yield. Subsequent facially selective cycloaddition with N-methylmaleimide occurs in good yield. The sequence may be carried out as a one-pot procedure and results in the formation of 4 bonds, 2 rings and 6 stereocentres
亲电引发的肟在内环烯烃和外亚甲基环烷烃上的肟环化反应,以立体和区域特异性方式产生,并以高收率生成顺式稠合双环硝酮。随后,以N-甲基马来酰亚胺进行的面部选择性环加成反应的收率很高。该序列可以一锅法进行,并导致形成4个键,2个环和6个立体中心。