1,2-Oxazolidines. Part V. Spiro and condensed biheterocyclic isomers from nitrones and 1,3-oxazolidin-2-ones
作者:Maria C. Aversa、Giampietro Cum、Placido D. Giannetto、Giovanni Romeo、Nicola Uccella
DOI:10.1039/p19740000209
日期:——
The cycloaddition reaction between nitrones and substituted 1,3-oxazolidin-2-ones yields condensation products and spiro-compounds, each type of product containing a 1,2-oxazolidine nucleus. Their stereochemistry was elucidated by lanthanide shift analysis. The main spectrometric characteristics and the chemical behaviour of these new systems are discussed. Evidence is reported that the formation of
硝酮与取代的1,3-恶唑烷-2-酮之间的环加成反应产生缩合产物和螺环化合物,每种产物均含有1,2-恶唑烷核。通过镧系元素位移分析阐明了它们的立体化学。讨论了这些新系统的主要光谱特征和化学行为。据报道,两种类型的异构体加合物的形成受与环加成竞争的重排过程控制。