4-fluoro-2-butynal: preparation and some examples of dienophilic properties
作者:A. Khanous、A. Gorgues、J. Cousseau
DOI:10.1016/s0022-1139(00)85034-4
日期:1990.9
4-Fluoro-2-butynal FCH2CCCHO (5) is prepared in good yield by formolysis of the corresponding fluoro-acetal FCH2CCCH(OEt)2 (4). The dienophilic properties of (5) are investigated towards 2,3-dimethyl-l,3-butadiene (6). cyclopentadiene (7) and 1,3- cyclohexadiene (8) [possible hazards during the reaction with (6)]. The results emphasize the activating effect of the FCH2 group on the electrophilic