The Vinylogous Aldol Reaction of Unsaturated Esters and Enolizable Aldehydes Using the Novel Lewis Acid Aluminum Tris(2,6-di-2-naphthylphenoxide)
作者:Jeffrey A. Gazaille、Tarek Sammakia
DOI:10.1021/ol300738f
日期:2012.6.1
(ATNP), and its use in the vinylogous aldol reaction between methyl crotonate and enolizable aldehydes are described. ATNP is related to Yamamoto’s Lewis acid, aluminum tris(2,6-diphenylphenoxide) (ATPH), but the 2-naphthyl groups more effectively block the α-position of aldehydes, enabling the selective enolization of crotonate esters in the presence of enolizable aldehydes. Vinylogous aldol reactions
描述了新型路易斯酸、三(2,6-二-2-萘基苯氧基铝) (ATNP) 的合成及其在巴豆酸甲酯和烯醇化醛之间的乙烯醇醛反应中的用途。ATNP 与 Yamamoto 的路易斯酸、三(2,6-二苯酚铝) (ATPH) 有关,但 2-萘基更有效地阻断醛的 α 位,从而在可烯醇化醛的存在下实现巴豆酸酯的选择性烯醇化. 然后,使用各种底物,乙烯基羟醛反应可以顺利进行并以高产率进行。