photoisomerization of α-(9″-anthryl)ethyl spiro[cyclopropane-1,9′-fluorene]-2-carboxylates (1c⇄2c) proceeds diastereoselectively through the selective intramolecular energy transfer from the second triplet state of anthryl group to the fluorenyl moiety. Asymmetric induction using optically active α-(9″-anthryl)ethyl group is achieved in high optical and chemical yields.
α-(9″-
蒽)乙基螺[
环丙烷-1,9'-
芴] -2-
羧酸酯(1c⇄2c)的光异构化是通过选择性的分子内能量从第二个三重态
蒽基转移到非对映异构体进行的。
芴基部分。利用光学活性α-(9″-
蒽基)乙基的不对称诱导以高光学和
化学产率实现。