In this work, we report the first selective, photocatalyzed [2+2]-cycloaddition of dehydroamino acids with styrenetype olefins. This simple, mild, and scalable approach relies on the use of the triplet energy transfer catalyst [Ir(dFCF 3 ppy 2 )dtbpy]PF 6 under visible light irradiation and provides fast access to valueadded substituted strained cyclobutane α-amino acid derivatives.
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