Catalyst‐ and Substrate‐Dependent Chemodivergent Reactivity of Stabilised Sulfur Ylides with Salicylaldehydes

Stabilised sulfur ylides are synthetically appealing compounds, which reactivity under Brønsted acid catalysis has been poorly explored. Herein, we report a new catalyst- and substrate- dependent chemodivergent reaction between stabilised salicylaldehydes, leading to the (suprising) formation of 2H-chromenes or dihydrobenzofurans products. Particular attention was set on unusual mechanisms involved. Two unique routes including two ylide units in reactions proposed. These pathways were validated by performing selectivity switch some cases, enabled modulation nucleophilicity ylide, loading catalyst reaction.