Phosgene → (R)-1-(4-chlorobenzyl)-5-(1-chlorocarbonylpyrrolidin-2-yl)-1H-1,2,4-triazole

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Reaction Steps

A solution of (R)-1-(4-chlorobenzyl)-5-(pyrrolidin-2-yl)-1H-1,2,4-triazole (216 mg, 0.82 mmol) and DIEA (233 mg, 1.90 mmol) in 5 mL of dry DCM was cooled to −20° C. under Ar, and a solution of phosgene (0.89 mL of 20% solution in toluene, 0.89 mmol) was added. The reaction mixture was stirred at RT for 2.5 days and the solvent was evaporated in vacuo. The residue was purified by chromatography (silica gel, hexane:EtOAc (1:1)) to give 202 mg of the desired product.

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