Synthesis of 1-Substituted Benzo[<i>c</i>]isoxazol-3(1<i>H</i>)-imines via Tandem Nitroso-Ene/Intramolecular Cyclizations of 2-Nitrosobenzonitrile
作者:Jenna L. Jeffrey、Sean P. McClintock、Michael M. Haley
DOI:10.1021/jo800055e
日期:2008.4.1
Instead of reacting via the expected coarctate cyclization pathway, 2-nitrosobenzonitrile undergoes a tandem nitroso-ene/intramolecular cyclization to form benzo[c]isoxazol-3(1H)-imines in very good yields under neutral conditions and at moderate temperatures. Treatment of three of the imines with HBF4 results in dimerization/condensation to furnish unusual, delocalized cationic systems.
2-亚硝基苯甲腈不是通过预期的缩合物环化反应进行反应,而是在中性条件下和中等温度下,以串联的亚硝基-烯/分子内环化反应以良好的收率形成了苯并[ c ]异恶唑-3(1 H)-亚胺。用HBF 4处理三个亚胺会导致二聚/缩合,从而提供不寻常的,离域的阳离子体系。