Studies on the Reactive Species in Fluoride-Mediated Carbon−Carbon Bond-Forming Reactions: Carbanion Formation by Desilylation with Fluoride and Enolates
作者:Margaret M. Biddle、Hans J. Reich
DOI:10.1021/jo0522409
日期:2006.5.1
bond-forming reactions was investigated. The regio- and diastereoselectivities of silanes reacting with cyclohexenone in the presence of a catalytic amount of fluoride was compared to the reactivity of analogous solvent-separated lithium ion pairs. Closely analogous behavior was observed, showing that carbanions and not siliconate complexes are the reactive species in the fluoride-catalyzed reactions. Spectroscopic
研究了氟化物介导的碳-碳键形成反应中的反应性物种。将在催化量的氟化物存在下与环己烯酮反应的硅烷的区域和非对映选择性与类似溶剂分离的锂离子对的反应性进行了比较。观察到非常相似的行为,表明碳负离子而不是硅酸酯络合物是氟化物催化反应中的反应性物种。光谱研究清楚地表明,苯硫基苄基阴离子将通过硅烷与三氟甲硅酸三(二甲基氨基)ulf或隐窝[2.1.1]溶剂化的烯醇锂的反应而形成。以α-(苯硫基)苄基锂的crypt [2.1.1]配合物为引发剂和烯醇盐为脱甲硅基反应的载体,催化循环平稳进行。