Base catalysed rearrangements involving ylide intermediates. Part 15. The mechanism of the Stevens [1,2] rearrangement
作者:W. David Ollis、Max Rey、Ian O. Sutherland
DOI:10.1039/p19830001009
日期:——
The Stevens [1,2] rearrangement of acyl-stabilised ammonium ylides has been investigated with regard to stereoselectivity, intramolecularity and the formation of products in addition to the [1,2] rearrangement product. A detailed study of the effects of reaction conditions upon the rearrangement of the ylide derived from the salt (13) has shown that the stereoselectivity (retention of the configuration
关于立体选择性,分子内和除[1,2]重排产物之外的产物形成方面,已经研究了酰基稳定的铵化铵的Stevens [1,2]重排。对反应条件对衍生自盐(13)的叶立德重排的影响的详细研究表明,立体选择性(手性迁移基团的构型保留)和分子内度随溶剂粘度的降低而降低。在0°C的水中,盐(13)的重排基本上是分子内的,几乎完全保留了迁移基团的构型。这些结果以及可以在随机自由基偶联的基础上合理化的产物分离结果表明,[1,