Stereoselective free-radical addition of secondary phosphine selenides to aromatic acetylenes
作者:Boris A. Trofimov、Nina K. Gusarova、Svetlana N. Arbuzova、Nina I. Ivanova、Alexander V. Artem’ev、Pavel A. Volkov、Igor’ A. Ushakov、Svetlana F. Malysheva、Vladimir A. Kuimov
DOI:10.1016/j.jorganchem.2008.11.043
日期:2009.3
Free-radical addition (AIBN, 65–70 °C, 5–7 h) of secondary phosphine selenides to arylacetylenes proceeds stereoselectively to give anti-Markovnikov adducts of predominantly Z-configuration (up to 97%) in 60–80% isolated yields, thus representing a rare example of stereoselective free-radical addition to the triple bond. Microwave irradiation (600 W) of the reactants with the same content of AIBN reduces
在芳基乙炔中进行自由基选择性加成(AIBN,65–70°C,5–7 h)次膦基硒化物,使其立体选择性生成反马氏复合物(主要为Z构型)(高达97%),分离产率为60-80% ,因此代表了向三键立体选择性自由基加成的罕见例子。微波辐射(600 W)和相同含量的AIBN会使反应时间减少到8分钟,尽管会影响立体选择性。在UV引发下,反应由于伯Z-加合物的异构化而失去其立体选择性。在该反应中,已经揭示了芳族取代基在三键处的特定的促进和控制Z构型的作用。