Chemoselective Aldol Reaction of Silyl Enolates Catalyzed by MgI<sub>2</sub> Etherate
作者:Wei-Dong Z. Li、Xing-Xian Zhang
DOI:10.1021/ol026585e
日期:2002.10.1
Mukaiyama-type aldol coupling of typical silyl enolates 2-4 with aryl or vinyl aldehydes and acetals was realized in the presence of 1-5 mol % of MgI(2) etherate (1) in a mild, efficient, and highly chemoselective manner. Iodide counterion, weakly coordinating peripheral ethereal ligands (Et(2)O) of Mg(II), and a noncoordinating reaction media (i.e. CH(2)Cl(2)) are among the critical factors for the
在存在1-5 mol%的MgI(2)醚化物(1)的情况下,以温和,有效和高度化学选择性的方式实现了典型的甲硅烷基烯醇盐2-4与芳基或乙烯基醛和缩醛的Mukaiyama型羟醛偶联。碘化物抗衡离子,弱配位的Mg(II)的外围醚配体(Et(2)O)和非配位的反应介质(即CH(2)Cl(2))是该催化系统独特反应性的关键因素。[反应:看文字]