Lewis Acid-Promoted Cyclization Reactions of Alkenyl Ethenetricarboxylates: Stereoselective Synthesis of 2-Oxotetrahydrofurans and 2-Oxopyrrolidines
作者:Shoko Yamazaki、Ken Fujinami、Yuki Maitoko、Khota Ueda、Kiyomi Kakiuchi
DOI:10.1021/jo401106m
日期:2013.9.6
Lewis acid-promoted intramolecular reactions of alkenyl ethenetricarboxylates and the corresponding amides have been examined. Reaction of allyl ethenetricarboxylates and the amides with Lewis acids (1–2 equiv) such as TiCl4, TiBr4, AlCl3, and AlBr3 gave 3,4-trans-halogenomethyl 2-oxotetrahydrofuran and pyrrolidine derivatives stereoselectively in high yields. The stereochemistries were determined
已经研究了路易斯酸促进的链烯基乙烯三羧酸酯和相应的酰胺的分子内反应。烯丙基三羧酸烯丙基酯和酰胺与路易斯酸(1-2当量),例如TiCl 4,TiBr 4,AlCl 3和AlBr 3的反应可以高产率立体选择性地生成3,4-反卤代甲基2-氧代四氢呋喃和吡咯烷衍生物。立体化学通过NOE实验确定。烷基取代的烯丙基乙烯三羧酸酯与路易斯酸的反应得到氯代2-氧代四氢呋喃和吡喃。对于某些烷基取代的底物,可在反应条件下形成阳离子中间体,并已获得重排产物。