Sodium Chloride → 4-(2-(4-Methylpiperazin-1-yl)ethoxy)pyridin-2-amine

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Reaction Conditions

Reaction Steps

Sodium hydride (60% in mineral oil; 43.56 g; 1089 mmol) was added to a 3 L reaction flask under nitrogen. A mechanical stirrer and thermocouple was attached. Dry diglyme (400 mL) was added. A solution of 2-(4-methylpiperazin-1-yl)ethanol (157 g; 1089 mmol) in diglyme (450 mL) was added slowly with stirring. The mixture was stirred with warming to 40° C. for 1 hour. 4-Chloropyridin-2-amine (70.0 g; 544.5 mmol) was added as a solid. The mixture was heated to 80° C. with stirring until effervescence had ceased. The temperature was increased to 157° C. for 16 hours. The mixture was allowed to cool and diluted with water (500 mL). THF (1000 mL) was added followed by sodium chloride (sufficient to saturate the aqueous phase). The phases were separated and the aqueous phase was further extracted with THF (3×800 mL). Additional water was added as required to aid in phase separation. The combined organic phases were dried with sodium sulfate (1000 g) for 16 hours and filtered. The solvent was removed under vacuum to remove the majority of the THF. The solution was filtered through Celite® to remove fine particulates rinsing with diglyme. The diglyme was removed under vacuum (10 mm Hg vacuum, with the bath temperature increased to 60° C.). The residue was placed under high vacuum for 1 hour and then triturated with ether (400 mL). The resulting solids were collected by filtration, washed with ether and dried under vacuum to give the product (100.4 g) as an off white solid.

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