Gold-Catalyzed Cyclization of Nonterminal Propargylic Amides to Substituted Alkylideneoxazolines and -oxazines
作者:A. Stephen K. Hashmi、Andreas M. Schuster、Martin Schmuck、Frank Rominger
DOI:10.1002/ejoc.201100342
日期:2011.8
The substrate scope of the gold-catalyzed cyclization of nonterminal propargylic amides to oxazolines and oxazines was investigated. Sixteen alkyl-substituted and 35 aryl-substited substrates were prepared by a very variable route from trimethylsilyl-(TMS-)protected, nonterminal propargylamines. Steric and electronic influences of the substituents on product selectivity were studied. A chloromethyl
研究了金催化的非末端炔丙基酰胺环化成恶唑啉和恶嗪的底物范围。十六个烷基取代和 35 个芳基取代的底物由三甲基甲硅烷基-(TMS-) 保护的非末端炔丙胺通过非常可变的路线制备。研究了取代基对产物选择性的空间和电子影响。炔烃上的氯甲基取代基显示出有效的 1,4-消除以传递乙烯基恶唑。在某些情况下,与炔烃上的烷基相连的第二个炔基会导致金催化/阿尔德-烯多米诺反应。使用 Barluenga 试剂可以以极好的收率形成碘亚烷基恶唑啉。与钯催化的方案相比,