Thionyl Chloride → 2-(CYCLOPROPYLAMINO)-3-PYRIDINECARBONYL CHLORIDE

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Reaction Steps

Thionyl chloride (25 ml, 40.8 g, 0.343 mol) was charged in a thin stream to 9.00 g, 0.048 mol, of 2-(cyclopropylamino)-3-pyridine carboxylic acid from Example 2 in acetonitrile. The mixture was heated at reflux temperature for 30 minutes. The mixture was allowed to cool and the thionyl chloride was distilled off at 40° C./23 in. Hg until the pot contents became thick. Toluene (25 ml) was added and distillation of thionyl chloride and toluene at 40° C. was continued until about one-half of the liquid was distilled. The remaining solution was allowed to cool and stirred to promote crystallization. Heptane (25 ml) was added to the mixture with stirring and the mixture filtered under a nitrogen atmosphere to obtain the title compound.

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