A new synthetic method of multisubstituted nipecotic acid (piperidine-3-carboxylic acid) derivatives has been developed by way of palladium-catalyzed decarboxylative cyclization of γ-methylidene-δ-valerolactones with imines. By employing the diethoxyphosphinoyl group as the N-protecting group for imines, the reaction proceeds smoothly with high diastereoselectivity. The products thus obtained can be
通过
亚胺与
钯催化的γ-亚甲基-
δ-戊内酯的脱羧环化反应,开发了一种新的多取代的
庚二酸(
哌啶-3-
羧酸)衍
生物的合成方法。通过将二乙氧基膦酰基作为
亚胺的N-保护基,反应以高的非对映选择性平稳地进行。由此获得的产物可以在简单的反应条件下进一步高效地衍生化。