Enantioselective Excited-State Nazarov Reaction: A Relay Strategy of Electrocyclization and Parallel Kinetic Resolution.

Org Lett

Shanghai Key Laboratory of Green Chemistry and Chemical Processes, State Key Laboratory of Petroleum Molecular & Process Engineering, School of Chemistry and Molecular Engineering, East China Normal University, Shanghai 200050, China.

Published: December 2024

We report herein the enantioselective photoinduced Nazarov reaction using a relay strategy of an electrocyclization, followed by parallel kinetic resolution (PKR). No enantioselectivity was observed during electrocyclization due to weak coordination between chiral ligands and the substrate's carbonyl group. However, PKR was successfully achieved in the deprotonation step with a bifunctional chiral thiourea ligand. Regioselective deprotonation, controlled by the chiral -dimethyl amine motif, produced -6,5,6-fused tricyclic stereoisomers with high ee and yields.

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http://dx.doi.org/10.1021/acs.orglett.4c04177DOI Listing

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