Base-Mediated Cyclocondensation of Salicylaldehydes and 2-Bromoallyl Sulfones for the Synthesis of 3-Sulfonylchromene Derivatives and Their Regioselective Friedel—Crafts Heteroarylation Reactions.

2016

A transition metal-free, vinylic bromide displacement reaction of bromoallyl sulfones (II) with phenolate nucleophiles is reported.

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