1,8-Diazabicyclo(5.4.0)undec-7-ene → Ethyl sulfamic acid-[6-chloro-5-(o-methoxy-phenoxy)-2-(4-pyridyl)-pyrimidin-4-yl]-amide

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Reaction Steps

4-Amino-6-chloro-5-(o-methoxyphenoxy)-2-(4-pyridyl)-pyrimidine (100 mg) was dissolved in THF (5 ml) and DCM (5 ml). DBU (46 mg) and DMAP (37 mg) were added followed by the addition of ethyl-sulfamoylchloride (prepared from ethylamine hydrochloride and sulfuryl chloride). The mixture was stirred for 12 h at r.t. The solvent was evaporated. Water and a 10% solution of citric acid were added followed by extraction with EtOAc and DCM. The combined organic layers were dried over sodium sulfate and the solvent was evaporated under reduced pressure. After purification of the residue by chromatography over silicagel with EtOAc/methanol/ammonia=4:1:0.5, ethyl sulfamic acid-[6-chloro-5-(o-methoxy-phenoxy)-2-(4-pyridyl)-pyrimidin-4-yl]-amide (10 mg) was obtained. tR=4.31 min, (LC); [M+H]+=436.14 (ES+).

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