Synthesis of Vinylogous Amides by Gold(I)-Catalyzed Cyclization of <i>N</i>-Boc-Protected 6-Alkynyl-3,4-dihydro-2<i>H</i>-pyridines
作者:Alberto Oppedisano、Cristina Prandi、Paolo Venturello、Annamaria Deagostino、Giulio Goti、Dina Scarpi、Ernesto G. Occhiato
DOI:10.1021/jo4019914
日期:2013.11.1
The gold(I)-catalyzed cyclization of N-Boc-protected 6-alkynyl-3,4-dihydro-2H-pyridines, prepared by the Sonogashira coupling of lactam-derived enol triflates or phosphates, provides vinylogous amides, which are useful intermediates in the synthesis of natural compounds. The Au(I)-catalyzed reaction is carried out with Ph3PAuOTf as a catalyst and proceeds via a 6-endo-dig cyclization to form a vinylgold
由内酰胺衍生的烯醇三氟甲磺酸酯或磷酸酯的Sonogashira偶合制备的金(I)催化的N -Boc保护的6-炔基-3,4-二氢-2 H-吡啶的环化反应可提供有用的乙烯基酰胺天然化合物合成中的中间体。Au(I)催化的反应以Ph 3 PAuOTf作为催化剂进行,并通过6内挖-环化反应进行,形成乙烯基金物质,该蛋白质在原型脱氢后生成环状氨基甲酸酯中间体。在大多数情况下,不会分离出该中间体,而是向反应混合物中添加碱可以快速,定量地输送目标乙烯基酰胺。海南海桑属天然化合物的首次合成 通过这种方法已经完成。