Base-Promoted Transannulation of Heterocyclic Enamines and 2,3-Epoxypropan-1-ones: Regio- and Stereoselective Synthesis of Fused Pyridines and Pyrroles
作者:Zheng Yang、Wen-Juan Hao、Hai-Wei Xu、Shu-Liang Wang、Bo Jiang、Guigen Li、Shu-Jiang Tu
DOI:10.1021/acs.joc.5b00067
日期:2015.3.6
Base-promoted transannulation of heterocyclic enamines and 2,3-epoxypropan-1-ones has been successfully achieved, providing a new access to structurally diverse fused pyridines and pyrroles with excellent regio- and stereoselectivity. Treatment with N-aryl 4-aminofuran-2(5H)-ones and 2,3-epoxypropan-1-ones under microwave heating resulted in functional furo[3,2-b]pyridines in good yields. The N-aryl
已成功实现了碱促进的杂环烯胺和2,3-环氧丙烷-1-酮的环过环化反应,为具有结构选择性和立体选择性的结构多样的稠合吡啶和吡咯提供了新途径。在微波加热下用N-芳基4-氨基呋喃-2(5 H)-one和2,3-环氧丙烷-1-酮处理可得到高产率的功能性呋喃[3,2- b ]吡啶。带有吸电子基团的N-芳基4-氨基吡咯-2(5 H)-参与反应,得到吡咯并[3,2- b ]吡啶,而其对应物带有电子中性基团或给电子基团经历了不同的反应途径形成吡咯并[3,2- b通过C–C键断裂产生的吡咯。