Synthesis of 4-aryl-azetidinones via intramolecular alkylation of nucleophilic arenes using acyliminium cations
作者:Bartosz Zambroń、Marek Masnyk、Bartłomiej Furman、Przemysław Kalicki、Marek Chmielewski
DOI:10.1016/j.tet.2010.09.024
日期:2010.11
nitrogen atom through methyloxy, or methylthio tethers. The reactions smoothly proceed to afford the corresponding 3-oxa- or 3-thia-4,5-benzocephams in a good yield. The sulfur atom can be easily removed by Raney nickel reduction to provide the title compounds.
在路易斯酸存在下衍生自4-乙烯基氧基-或4-酰氧基-氮杂环丁烷-2-酮的酰基酰亚胺阳离子可以使通过甲氧基或甲硫基系链与β-内酰胺氮原子键合的亲核芳烃烷基化。反应平稳进行,以良好的收率得到相应的3-氧杂-或3-硫杂-4,5-苯并胆固醇。可以通过阮内镍还原将硫原子轻松除去,以提供标题化合物。