Efficient Synthesis of Tetrasubstituted Furans from Nitroallylic Acetates and 1,3-Dicarbonyl/α-Activating Ketones by Feist-Bénary Addition-Elimination
作者:Wan-Yun Huang、Yi-Chieh Chen、Kwunmin Chen
DOI:10.1002/asia.201100988
日期:2012.4
Pure organic: The synthesis of tetrasubstitutedfurans often involves transition‐metal catalysis or metal–halogen exchange reactions. A new approach to these heterocycles employs the Feist–Bénaryaddition–elimination process using nitroallylicacetates and 1,3‐dicarbonyls (see scheme; X=C, O).
纯有机物:四取代呋喃的合成通常涉及过渡金属催化或金属-卤素交换反应。对这些杂环的一种新方法是采用Feist-Bénary加成-消除工艺,该工艺使用乙酸烯丙酯和1,3-二羰基化合物(请参见方案; X = C,O)。
Synthesis of functionalized and fused furans and pyrans from the Morita–Baylis–Hillman acetates of nitroalkenes
作者:Divya K. Nair、Shaikh M. Mobin、Irishi N.N. Namboothiri
DOI:10.1016/j.tetlet.2012.04.084
日期:2012.6
The Morita–Baylis–Hillman (MBH) acetates derived from nitroalkenes and ethyl glyoxylate have been transformed in one pot at room temperature to highly fused and functionalized furans and pyrans in good to excellent yield. The reaction involves a cascade Michael–oxa-Michael addition of β-dicarbonyl compounds to the MBH acetates in the presence of an amine base such as DABCO. An unusual switching of