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Saccharin is a versatile scaffold to build up different heterocycles with relevance in asymmetric catalysis, agricultural chemistry, medicinal chemistry, and so forth. Here, we report a photochemical strategy to obtain seven-membered ring benzosultams in one step, using saccharin anion as starting material. The reaction can be improved in a photoflow reactor and its scope was evaluated. Furthermore, computational study at the CASPT2//CASSCF level of theory was also performed to rationalize the involved mechanism.

Regioselective Photocycloaddition of Saccharin Anion to π-Systems: Continuous-Flow Synthesis of Benzosultams