Lawesson's reagent → (R)-2-(Benzo[1,3]dioxol-5-yloxy)-5-fluoro-N-[2-fluoro-4-(1-thiocarbamoyl-ethoxy)-benzyl]-nicotinamide

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Reaction Steps

A solution of (R)-2-(benzo[1,3]dioxol-5-yloxy)-N-[4-(1-carbamoyl-ethoxy)-2-fluoro-benzyl]-5-fluoro-nicotinamide (1.0 g, 2.12 mmol) and Lawesson's reagent (0.52 g, 1.27 mmol) in dry tetrahydrofuran (10 ml) was stirred at room temperature 2 h. The solvent was removed in vacuo. The residue was adsorbed onto silica gel and purified by column chromatography (20% ethyl acetate/hexane) to afford 1.01 g of a yellow solid (98% yield).

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