A simple and metal-free radical addition/cyclization reaction of N-aryl acrylamides with CHCl 3 or CH 2 Cl 2 as radical source in the presence of benzoyl peroxide (BPO) as oxidant is developed, which affords polychloromethylated 2-oxindoles in moderate to good yields.
An effective visible-light mediated Ru-catalyzed protocol for accessing 6H-benzo[c]chromenes from benzyloxybenzenediazonium salt via a sequence of dediazoniation, intramolecular radical cyclization and aromaticzation has been developed. The protocol features mild conditions, simple operation and high efficiency, providing a new approach for synthesizing 6H-benzo[c]chromenes.
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