Pyridine → N-methylpyridinium dichlorophophate

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Anhydrous pyridine (5 mL) was put in a reactor containing a small magnetic stirbar and cooled in an ice bath. Methyldichlorophosphate (1.0 mL) was added dropwise. The mixture was kept cold for another 15 minutes during which a precipitate of N-methylpyridinium dichlorophosphate formed. Adamantane ethanol dissolved in 5 mL of pyridine was added to the reactor and the reactor sealed after the reaction mixture was frozen. The resulting mixture was stirred overnight at room temperature. The sealed reacted was then opened and the resulting mixture was poured into 10% sodium bicarbonate (50 mL). This resulting solution was then evaporated in vacuo. 800 mL of water was added to the remaining solid and product extracted with 150 mL ether. The aqueous phase was acidified with 2 N HCl to pH=1.4 and then extracted with 3×150 mL of CHCl3:nBuOH (7:3). The organic layer was washed with water and the mixed solvents were evaporated in vacuo to form a solid phase. This solid was recrystallized with acetone/hexane, affording a white solid with 27% yield. Electrospray mass spectroscopy analysis revealed the pure, desired product.

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