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Multicomponent condensation reaction with aldehydes, phenols, and olefins.a a Reaction conditions: 2.0 mmol of phenol, 2.0 mmol of aldehdye, and 1.0 mmol of dienophile, 0.5 M with respect to dienophile and 10 mol % FeCl3·6H2O with respect to phenol; isolated yields; diastereomeric ratio determined by 1H NMR; detailed experimental conditions are provided in the Supporting Information. b Yield and dr after trituration with hot hexanes.
