Six-Membered Ring Formation from Lewis Acid Promoted Reactions of 2-Substituted 2-Alkenyl Amides and Esters of Ethenetricarboxylate
作者:Shoko Yamazaki、Kohta Ueda、Yugo Fukushima、Akiya Ogawa、Kiyomi Kakiuchi
DOI:10.1002/ejoc.201402637
日期:2014.11
The Lewis acid promoted reactions of 2-substituted 2-propenyl amides and the 2-methylbuta-2,3-dienyl ester of ethenetricarboxylate have been examined. The reactions of 2-substituted 2-propenyl amides with AlCl3 gave 2-oxo-5,6-dehydropiperidines as the major products. The reaction of 2-methylbuta-2,3-dienyl ester with Lewis acids such as AlCl3 and SnCl4 gave 2-oxo-3,6-dihydropyran as the major product
路易斯酸促进了 2-取代的 2-丙烯基酰胺和乙烯三羧酸的 2-甲基丁-2,3-二烯酯的反应。2-取代的 2-丙烯酰胺与 AlCl3 反应得到 2-氧代-5,6-脱氢哌啶作为主要产物。2-甲基丁-2,3-二烯基酯与路易斯酸如AlCl3和SnCl4反应得到2-氧代-3,6-二氢吡喃作为主要产物。观察到六元环形成优于五元环形成。