Spiroheterocycles from reaction of nitrones with methylene-γ-butyrolactones and some of their rearrangements
作者:Christophe Roussel、Rachid Fihi、Kabula Ciamala、Joël Vebrel、Touria Zair、Claude Riche
DOI:10.1039/b300628j
日期:——
Cycloaddition of nitrones 1 with methylene-gamma-butyrolactones 2, 3 and 4 afforded spiroadducts 5, 6 and 7 with high selectivity. Mixtures of diastereoisomers were usually obtained, whose structures were established by 1H and 13C NMR spectroscopies or X-ray crystallography. Treatment of spiroadducts in acidic and alkaline media led to different, unexpected and novel rearrangements.
硝酮1与亚甲基-γ-丁内酯2、3和4的环加成反应提供了具有高选择性的螺环化合物5、6和7。通常获得非对映异构体的混合物,其结构通过1H和13C NMR光谱学或X射线晶体学确定。在酸性和碱性介质中螺旋管的处理导致不同,意外和新颖的重排。