On the action of a Lewis acid, 2,2-dimethoxyethyl acrylate is readily transformed into a reactive cationic dienophile, and it reacts with dienes under mild conditions to give Diels-Alder adducts in good yields with high stereo-and/or regioselectivity. 2-Oxopropyl acrylate and 2-oxocyclopentyl acrylate are also found to be converted into alternative cationic dienophiles by a facile procedure.
在
路易斯酸的作用下,
丙烯酸2,2-二甲氧基
乙酯很容易转变为反应性阳离子亲二烯体,并在温和条件下与二烯反应,以高收率和高的立体选择性和/或区域选择性得到狄尔斯-阿尔德加合物。还发现
丙烯酸2-氧代
丙酯和
丙烯酸2-氧代环戊基酯通过简便的方法转化为替代性阳离子二烯亲和剂。