Chalcones thiol adducts

SSA is an efficient catalyst for thia-Michael addition to electron-deficient and sterically unhindered conjugated enones under solvent-free and mild conditions [95]. The reactions of thiols with enones such as cyclohexenone, cyclopentenone and ethyl vinyl ketone afforded the corresponding adducts in excellent yields. However, when chalcones were used as an enone, the corresponding adducts were obtained in very poor yields (Scheme 5.16). 

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