A highly efficient Mukaiyama aldol reaction between ketones and trimethylsilyl enolates in the presence of potassium alkoxide–crown ether complexes as Lewis base catalysts (0.3–5 mol %), which minimized the competing retro-aldol reaction, was developed. These catalysts promoted other addition reactions of trimethylsilyl reagents to ketones and aldimines, such as silyltrifluoromethylation, silylcyanation
开发了一种高效的Mukaiyama醇醛酮与三甲基甲
硅烷基烯醇化物之间的反应,该醇存在于作为路易斯碱催化剂的烷氧基
钾-
冠醚配合物(0.3-5 mol%)的存在下,从而使竞争性逆醛醇反应最小化。这些催化剂促进了三甲基甲
硅烷基试剂与酮和醛胺的其他加成反应,例如甲
硅烷基三
氟甲基化,甲
硅烷基
氰化和甲
硅烷基膦酰基化。当催化剂在温和的反应条件下用作布朗斯台德碱时,也进行了酮的直接氢膦酰化反应。