Instigated by olfactory analysis of odorant molecules, the constitutions of 3,4-dihydrocoumarins prepared by PIFA-based oxidative cyclizations of 3-arylpropionic acids were revised by means of 2D NMR and X-ray analysis. Supported by computational analysis, the migratory mechanism of intermediate spirolactonic cations has been amended: 1,2-alkyl shifts instead of 1,2-carboxylic shifts were selectively obtained
在气味分子嗅觉分析的启发下,通过 2D NMR 和 X 射线分析对 3-芳基
丙酸基于
PIFA 的氧化环化制备的 3,4-二氢
香豆素的组成进行了修正。在计算分析的支持下,中间体
螺内酯阳离子的迁移机制得到了修正:选择性地获得了1,2-烷基位移而不是1,2-羧基位移。