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Inexpensive copper(II) acetate effectively catalyzes cross‐coupling of electron‐deficient as well as electron‐rich arylboronic acids with 4‐methylsulfanyl‐2‐alkylamino‐3‐nitro‐4H‐chromenes under near neutral conditions at room temp. to furnish a range of 4‐aryl‐4H‐chromenes. This new strategy enabled substitution of the C(4)SMe group present on a sp3 hybridized carbon of the 4H‐chromenes with aryl/heteroaryl...
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