A variety of polysubstituted δ-lactones containing three or four stereocenters were prepared from various dialkyl 2-(3-oxo-1,3-diarylpropyl)malonates by a Barbier-type zinc-mediated allylation or cyclohexenylation of the keto group, followed by intramolecular lactonization/transesterification. The stereochemistry of the major isomers was confirmed by X-ray crystal structure analysis of representative
通过 Barbier 型
锌介导的酮基烯丙基化或
环己烯基化,从各种 2-(3-氧代-1,3-二芳基丙基)
丙二酸二烷基酯制备了多种含有三个或四个立体中心的多取代 δ-内酯,然后进行分子内反应。内酯化/酯交换。主要异构体的立体
化学通过代表性化合物的 X 射线晶体结构分析得到证实。