Lithium Acetate-Catalyzed Aldol Reaction between Aldehyde and Trimethylsilyl Enolate in Anhydrous or Water-Containing<i>N</i>,<i>N</i>-Dimethylformamide
AcOLi catalyst, the aldolreaction in water-containing DMF was studied in detail. AcOLi and various metal carboxylates behaved as effective Lewis base catalysts in aldolreactionsbetweentrimethylsilylenolate and aldehydes in DMF-H 2 O (50:1) (Tables 6, 7). One of the most characteristic points of the above reaction that took place in water-containing DMF is that the aldehydes having a free amide
乙酸锂 (AcOLi) 催化的三甲基甲硅烷基烯醇化物和醛之间的醛醇反应在无水 DMF 或吡啶中顺利进行,在弱碱性条件下以良好至高产率提供相应的醛醇(表 1-5)。这种催化羟醛反应也可以通过使用其他金属羧酸盐顺利进行,这些金属羧酸盐通过用碳酸锂 (Li 2 CO 3 ) 处理羧酸很容易原位制备(表 2,方案 5)。为了展示温和易得的AcOLi催化剂的效果,详细研究了含水DMF中的羟醛反应。AcOLi 和各种金属羧酸盐在 DMF-H 2 O (50:1) 中三甲基甲硅烷基烯醇酯和醛之间的羟醛反应中充当有效的路易斯碱催化剂(表 6、7)。在含水DMF中发生的上述反应的最特征点之一是具有游离酰胺和羟基甚至羧基的醛反应平稳并以中等至高产率提供所需的醛醇29-31(表 8,条目 12-15)。由羧酸酯衍生的三甲基甲硅烷基烯醇化物在上述反应中表现得与优异的亲核试剂相似。这是路易斯碱催化醛醇反应的第一个例
Iron(III) Chloride as a Water-Compatible Lewis Acid for Diastereoselective Aldol Reactions in Water in the Presence of a Surfactant
作者:Naohiro Aoyama、Kei Manabe、Shu Kobayashi
DOI:10.1246/cl.2004.312
日期:2004.3
Diastereoselective aldol reactions of various aldehydes with silicon enolates in water have been successfully carried out using iron(III) chloride and a surfactant. Contrary to previous understandi...
these reactions. Enhanced preference for the more sterically demanding Michael adducts is obtained with Bu(2)Sn(OTf)(2), SnCl(4), and Et(3)SiClO(4) in the former reaction while TiCl(4) gives the highest selectivity for the less sterically demanding products in the latter case. These results are interpreted in terms of alternative reaction mechanisms. The reaction of less bulky ketene silyl acetals are
Michaelreactions between trimethylsilyl enolates and α,β-unsaturated carbonyl compounds by using a Lewis base catalyst such as lithium benzamide 4 or lithium succinimide 5 in DMF proceeded smoothl...
effective in dry DMF. The above-mentioned lithium acetate-catalyzed Mannich-type reaction between aldimines and various trimethylsilyl (TMS) enolethers such as silyl ketene acetal proceeded smoothly even in water-containing DMF. Then, Lewis base catalyzed three-component Mannich-type reactions of TMS enolether, tosylamide, and aromatic aldehyde having electron-withdrawing group such as p-nitrobenzaldehyde