Asymmetric induction via intramolecular T2-sensitization: Photoisomerization of α-(9″-anthryl)ethyl spiro[cyclopropane-1,9′-fluorene]-2-carboxylates

Add time:07/11/2019    Source:sciencedirect.com

The 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.

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