Bis-hydrothiolation of alkynes providing anti -Markovnikov dithioacetals is reported. Lewis-acidic Ca(OSO 2 C 4 F 9 ) 2 (Ca(ONf) 2 ) was synthesized for the first time and was shown to be an excellent catalyst for the transformation. The reaction is highly selective and has a wide substrate scope. It was revealed that vinyl sulfides were intermediates for this transformation and that Ca(ONf) 2 efficiently catalyzed the unprecedented reactions of unactivated vinyl sulfides with thiols to afford the dithioacetals in good to high yields.
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Hut’ka et al. (2014) studied this question.
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