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. 2020 Apr 15;26(23):5190–5194. doi: 10.1002/chem.202000720

Scheme 3.

Scheme 3

Catalyzed enantioselective [2+2] photocycloaddition of 2‐cyclohexenone‐3‐carboxylic acid (12) and 2‐ethylbutene and subsequent benzylation; inset: structure of the decarboxylation product 17 obtained from intermediate 13.