Intramolecular Keto Lactam Condensation: A Convenient and Straightforward Approach to Bicyclic Vinylogous Lactams
作者:Pei-Qiang Huang、Ting Fan
DOI:10.1002/ejoc.201701060
日期:2017.11.24
lyl trifluoromethanesulfonate (TBDMSOTf), lactam activation with triflic anhydride (Tf2O), and a tandem cyclocondensation reaction. The reaction can be run in a one-pot manner or in a two-step fashion, both under mild conditions. The yields for the one-pot version were 52–80 %. In some cases, the two-step version gave higher overall yields (44–85 %) than the one-pot version.
尽管醛醇缩合是众所周知的反应,但氮杂型醛醇缩合,即常见的酮内酰胺分子内缩合产生双环乙烯基内酰胺,是一种要求很高的转化,在有机合成和药物化学中都有潜在的应用。这种类型的环化的已知方法需要几个步骤。在本文中,我们公开了一种简单的方法,包括用叔丁基二甲基甲硅烷基三氟甲磺酸酯 (TBDMSOTf) 原位形成甲硅烷基烯醇醚、用三氟甲磺酸酐 (Tf2O) 活化内酰胺和串联环缩合反应。反应可以以一锅方式或以两步方式进行,均在温和条件下进行。一锅版的产率为 52-80%。在某些情况下,