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The direct cyclization of aryl triflates with terminal oxiranes was achieved through palladium/norbornene (Pd/NBE) cooperative catalysis. A wide range of 2,3-dihydrobenzofurans were produced in good to high yields by the strategy. Good functional group tolerance was also demonstrated. This reaction provides an alternative method for preparing value-added 2,3-dihydrobenzofurans starting from readily available phenoxides and expands the scope of Catellani-type reactions in organic synthesis.
Fu et al. (Thu,) studied this question.