Monochloramine → HCID 90010382, compound

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Reaction Steps

To a solution of 4-fluoro-1H-pyrrole-2-carboxylic acid ethyl ester (1.57 g, 10.0 mmol) in 20 ml DMF is added potassium tert-butylate (2.24 g, 20.0 mmol) under nitrogen. After stirring at room temperature for 90 minutes, the chloroamine solution from above (110 ml, ca. 25 mmol) is added slowly, after which the mixture is stirred for 5 minutes at room temperature. The reaction mixture is partitioned between saturated sodium bisulfite solution and tert-butyl methyl ether. The organic phase is dried over sodium sulfate and evaporated. The residue is chromatographed on a silica gel column with cyclohexane/dichloromethane as eluent to afford 1-amino-4-fluoro-1H-pyrrole-2-carboxylic acid ethyl ester as white solid; HPLC/MS 2.21 min (B), [M+H] 173;

Provenance & Evidence