Potassium ethanethioate → (+/-)S-((1S,2R,4R,6S)-2-((tert-butoxycarbonyl)amino)-4-(3-((tert-butoxycarbonyl)amino)pyridin-4-yl)-6-methylcyclohexyl) ethanethioate

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To a solution of (+/−)-(1R,2R,4R,6S)-2-(tert-butoxycarbonylamino)-4-(3-(tert-butoxycarbonylamino)pyridin-4-yl)-6-methylcyclohexyl methanesulfonate (1.0 equiv.) in DMF (0.25 M) was added potassium thioacetate (6.0 equiv.). The mixture was stirred for 6 hours in a 60° C. bath under Ar. Upon cooling and the residue was partitioned between EtOAc and H2O. The organic layer was washed with H2O (3×), Na2CO3(sat.), NaCl(sat.), dried over MgSO4, filtered, concentrated and purified by ISCO SiO2 chromatography to yield (+/−)S-((1S,2R,4R,6S)-2-((tert-butoxycarbonyl)amino)-4-(3-((tert-butoxycarbonyl)amino)pyridin-4-yl)-6-methylcyclohexyl) ethanethioate in 87% yield. LC/MS (m/z)=480.3 (MH+), Rt=0.82 min.

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