New synthesis and cyclopropanation of α-phenylselanyl α,β-unsaturated ketones with non-stabilized phosphorus ylides
作者:Sébastien Redon、Stéphane Leleu、Xavier Pannecoucke、Xavier Franck、Francis Outurquin
DOI:10.1016/j.tet.2008.07.025
日期:2008.9
A general method for the preparation of α-phenylselanyl enones is described. Phosphorus ylides react with these α-phenylselanyl enones in a 1,4-addition, leading to cyclopropanes and/or dihydrofurans, depending on the substitution pattern. This unusual reactivity is due to the phenylselanyl moiety, hindering the carbonyl of the enone and making it less prone to 1,2-additions or promoting conjugate
描述了制备α-苯基硒基烯酮的一般方法。磷取代基与这些α-苯基硒基烯酮以1,4-加成反应,生成环丙烷和/或二氢呋喃,具体取决于取代方式。这种不寻常的反应性是由于苯硒基部分造成的,它阻碍了烯酮的羰基,使其更不容易通过电子作用加成1,2-加成或促进共轭加成。