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0 °C

NaH (60% dispersion in mineral oil, 1.2 g, 30 mmole) was added portionwise over 10 min to a solution of N-(diphenylmethylene)glycine ethyl ester (8.0 g, 30 mmole) in DMF (150 mL) with stirring under Ar at 0° C. The reaction was stirred for 15 min, then 2-amino-5-bromo-3-(bromomethyl)pyridine hydrobromide (5.0 g, 14.4 mmole) was added in one portion. The reaction was allowed to warm to RT and stir for 18 h, then was concentrated under vacuum. The remaining residue was taken up in EtOAc (150 mL), hexane (150 mL), and H2O (150 mL). The resulting suspension was triturated and filtered, and the solid was dried under vacuum to give the title compound (3.27 g, 56%) as an off-white solid: 1H NMR (400 MHz, d6-DMSO) δ 10.92 (s, 1 H), 8.23 (s, 1 H), 7.86 (s, 1 H), 7.26-7.55 (m, 10H), 4.05 (dd, 1 H), 3.10 (t, 2 H); MS (ES) m/e 406.0 (M+H)+.

1. stirringThe reaction was stirred for 15 min
2. temperatureto warm to RT
3. stirringstir for 18 h
4. concentrationwas concentrated under vacuum
5. customThe resulting suspension was triturated
6. filtrationfiltered
7. customthe solid was dried under vacuum