作者:Nicolas Giuseppone、Jacqueline Collin
DOI:10.1016/s0040-4020(01)00902-4
日期:2001.10
Samarium diiodide is an efficient precatalyst for tandem Michael–aldol reactions, which allow the formation of two carbon–carbon bonds by successive additions of a ketene silyl acetal and an aldehyde on cyclic α,β-unsaturated ketones. The adducts are isolated as silyl ethers, in good yields, and in some cases with high diastereoselectivities when the reactions are performed at low temperatures. Comparative
io二碘化物是串联迈克尔-羟醛反应的有效前催化剂,通过在环α,β-不饱和酮上连续添加乙烯酮甲硅烷基乙缩醛和醛,可以形成两个碳-碳键。加成物以高收率的形式分离为甲硅烷基醚,并且当在低温下进行反应时,在某些情况下具有高非对映选择性。提出了其他镧系元素碘化物对相同串联反应活性的比较研究。对于PGF的正式合成中的关键步骤2α已经通过串联迈克尔羟醛钐催化的序列来执行。