Intramolecular Hetero-Diels-Alder Reaction of 3-Benzylidene-1,2-dicarbonyl Compounds
作者:Lutz -F. Tietze、Thomas Brumby、Martina Pretor
DOI:10.1055/s-1987-28049
日期:——
The intramolecular hetero-Diels-Alder reaction of benzylidene 2-oxocarboxylic acid esters 7 is described, and the diastereoselectivity of the reaction determined. Condensation of the aldehyde 1 with 2-oxocarboxylic acids 5a, b followed by esterification gives 7a, b which cyclize in refluxing xylene to 8a, b and 9a, b in better than 95% yield.
描述了苯亚甲基 2-氧代羧酸酯 7 的分子内异狄尔斯-阿尔德反应,并测定了反应的非对映选择性。 醛 1 与 2-氧代羧酸 5a, b 缩合后进行酯化反应,得到 7a, b,它们在回流二甲苯中环化生成 8a, b 和 9a, b,收率优于 95%。