Equatorial Preference in the GaCl<sub>3</sub>-Promoted Ethenylation of Cyclic Ketones
作者:Masahiko Yamaguchi、Mieko Arisawa、Chie Miyagawa
DOI:10.1055/s-2002-19298
日期:——
Silylenolethers derived from substituted cyclohexanones are ethenylated with trimethylsilylethyne in the presence of GaCl 3 . Carbon-carbonbondformation was completed in less than 5 min at room temperature and protodegallation of the organogallium intermediate formed with 6 M sulfuric acid gave β-enones. The reactions exhibit a bias for the equatorial C-C bondformation, which contrasts the axial
由取代的环己酮衍生的甲硅烷基烯醇醚在 GaCl 3 存在下用三甲基甲硅烷基乙炔乙烯化。在室温下,碳-碳键的形成在不到 5 分钟的时间内完成,用 6 M 硫酸形成的有机镓中间体的原脱镓过程得到 β-烯酮。该反应表现出对赤道CC键形成的偏差,这与烯醇烷基化的轴向立体化学形成对比。讨论了这种立体选择性的起源。