On-Water Vinylogous Mukaiyama-Michael Addition of Heterocyclic 2-Silyloxydienes to 1,2-Diaza-1,3-dienes: One-Pot Three-Step Entry to Functionality-Rich Pyrroles
作者:Lucia Battistini、Luca Dell'Amico、Andrea Sartori、Claudio Curti、Giorgio Pelosi、Giovanni Casiraghi、Orazio A. Attanasi、Gianfranco Favi、Franca Zanardi
DOI:10.1002/adsc.201100296
日期:2011.8
prepared in good yields in a highly practical one-pot three-step procedure. The key reaction of this process, which involves an uninterrupted sequence of reactions on-water, is a diastereoselective vinylogous Mukaiyama–Michael addition reaction (VMMcR) of heterocyclic 2-silyloxydienes to 1,2-diaza-1,3-dienes mediated by water itself. Subsequent in situ addition of catalytic aqueous sodium carbonate promotes
已经以高度实用的一锅三步法高产率地制备了稠密取代的吡咯羧酸酯。该过程的关键反应涉及水上不间断的反应序列,是水介导的杂环2-甲硅烷基氧二烯与1,2-二氮杂-1,3-二烯的非对映选择性乙烯基Mukaiyama-Michael加成反应(VMMcR)。本身。随后原位添加催化性碳酸钠水溶液可促进分子内氮杂-迈克尔加成,并具有最终的开环和芳构化作用。优越的使用水在VMMcR既是反应介质和启动子VIS-à-VIS 强调了常规路易斯酸在有机溶剂中的部署,这在反应速率,效率,立体选择性和整体实用性方面提供了最佳结果。