An effective regiodivergent synthesis toward 1-and 3thiosugars was achieved through palladium and cobalt catalysis, respectively. β-1-Thiosugars were obtained from 3,4-O-carbonateglycals and various thiols catalyzed by Pd 2 (dba) 3 in good yields with exclusive stereoselectivity and chemoselectivity, while only (3S)-3thiosugars were generated via Co(BF 4 ) 2 . Experiments and DFT calculations supported the proposed mechanism that the thiol moiety preferred to form a hydrogen bond with C4-oxygen from top-face in Pd conditions but thiols would coordinate with cobalt from bottom-face in Co conditions. The difference between Pd/Co−C1 and Pd/Co−C3 bond lengths of key intermediates provided further insights into the 1,3-regioselectivity.
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