Fumaric Acid → 5-Trimethylsilyl-3-(1-methyl-2-pyrrolidinyl)pyridine fumarate

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The above-described pyridine derivative was converted into invention compound of Formula I by the addition of one equivalent of fumaric acid to a methanol (5 mL) solution of the free amine at 25° C. After 30 minutes the solvent was removed in vacuo and the residue pumped under high vacuum. Trituration with diethyl ether followed by recrystallization from ethyl acetate afforded 5-trimethylsilyl-3-(1-methyl-2-pyrrolidinyl)pyridine fumarate, (51%). M.p. 161°-162° C. (EtOAc); 1H NMR (D2O, 300 MHz): δ 8.48 (s, 2H), 8.26 (s, 1H), 6.25 (s, 3H), 4.24 (bm, 1H), 3.53 (bm, 1H), 3.03 (bm, 1H), 2.43 (s, 3H), 2.27 (m, 1H), 1.9-2.1 (m, 3H), 0.0 (s, 9H).

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