The regiochemistry of intramolecular n-alkenylnitrone additions: preparative and mechanistic implications
作者:Wolfgang Oppolzer、Samuel Siles、Roger L. Snowden、Bartholomeus H. Bakker、Martin Petrzilka
DOI:10.1016/s0040-4039(01)86596-5
日期:——
The opposite regiochemistry, observed for the reactions 7a → 8a and 7d → 8d, as compared with additions 7b → 9b, 7c → 9c and 7e → 9e, supports the hypothesis that in the transition state of nitrone-olefin additions the new C,C bond is more advanced than the C,0, bond. Further examples show the superimposition of substituent effects on this intramolecular control.
与添加物7b→9b,7c→9c和7e→9e相比,在反应7a→8a和7d→8d中观察到相反的区域化学,支持以下假设:在硝基烯烃添加的过渡态中,新的C,C键比C,0键更高级。进一步的实例显示取代基作用在该分子内对照上的叠加。