depending upon the reaction conditions and the reactivity of donor molecules. The adduct anions, both 1:1 and 1:2 types, are quenched with alkyl halides or water in a highly stereoselective manner to produce α-silylated esters. A rigid intramolecular chelation working in the adduct anions is partly responsible for the high selectivity.
有机镁或
锂与 2-(三甲基甲
硅烷基)
丙烯酸甲酯的迈克尔加成产生 1:1 或 1:2 的加合物阴离子,这取决于反应条件和供体分子的反应性。1:1 和 1:2 类型的加合物阴离子以高度立体选择性的方式用卤代烷或
水猝灭以产生 α-甲
硅烷基化酯。在加合物阴离子中起作用的刚性分子内螯合是高选择性的部分原因。