Multicomponent Cascade Reactions: Sequential [1 + 4] and [2 + 3] Cycloadditions for the Generation of Heterocyclic Ring Systems
作者:Nicolas M. Fédou、Philip J. Parsons、Eddy M. E. Viseux、Alan J. Whittle
DOI:10.1021/ol050892d
日期:2005.7.1
[reaction: see text]. A novel intermolecular nitrile oxide cycloaddition sequence has been developed for the formation of highly substituted heterocyclic rings. Reaction of trimethylsilyl cyanide with epoxides generates isonitriles which can react with nitroalkenes to form N-(isoxazolylidene)alkylamines. After fragmentation to nitrile oxides, the dipoles can undergo intermolecular 1,3-dipolar cycloadditions