Lawesson's reagent → (2S, 4R)-4-methanesulfonyloxy-1-(4-nitrobenzyloxycarbonyl)-2-thiocarbamoylpyrrolidine

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To a solution of (2S,4R)-2-carbamoyl-4-methanesulfonyloxy-1-(4-nitrobenzyloxycarbonyl)pyrrolidine (7 g) in tetrahydrofuran (210 ml) was added 2,4-bis(4-methoxyphenyl)-1,3-dithia-2,4-diphosphetane-2,4-disulfide (3.65 g) and the solution was stirred for 2 hours under refluxing. After the solvent was removed, the resulting oily residue was subjected to a column chromatography on silica gel (150 g) eluting with a mixture of n-hexane and ethyl acetate (2:3 V/V) to give (2S,4R)-4-methanesulfonyloxy-1-(4-nitrobenzyloxycarbonyl)-2-thiocarbamoylpyrrolidine (5.55 g).

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