Efficient Synthesis of 4-Cyano 2,3-Dihydrooxazoles by Direct Amination of 2-Alkylidene 3-Oxo Nitriles
作者:Stefania Fioravanti、Lucio Pellacani、Paolo A. Tardella、Edoardo Burini、Alberto Morreale
DOI:10.1055/s-2005-917097
日期:——
The addition of N-protected O-sulfonyl hydroxylamine derivatives on 2-alkylidene 3-oxo nitriles gives 2,5-disubstituted 4-cyano 2,3-dihydrooxazoles (4-oxazolines) by a practical and efficient synthetic procedure under very mild conditions in high yields. Likely, the formation of N,O-heterocycles proceeds through a domino reaction involving a fast rearrangement of unstable 2-acyl 2-cyano aziridines.
在 2- 亚烷基 3-氧代腈纶上添加 N 保护的 O-磺酰基羟胺衍生物,可以在非常温和的条件下,通过实用高效的合成程序得到 2,5-二取代的 4-氰基 2,3-二氢恶唑(4-恶唑啉),而且产量很高。N,O-杂环的形成可能是通过不稳定的 2-酰基 2-氰基氮丙啶快速重排的多米诺反应进行的。