Trimethylsilyl iodide → 4-[2-(4-Fluorophenyl)-7-piperidin-4-ylimidazo-[1,2-a]pyridin-3-yl]piperidin-2-ylamine

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Reaction Steps

Benzyl carbonate 37 (190 mg, 0.36 mmol) was slurried in CH3CN (5 mL) in a 28 mL Pyrex Plus tube. TMSI (720 mg, 3.6 mmol) was then added, and the reaction was allowed to stir at room temperature for 2 hours. The reaction was then concentrated under reduced pressure. The crude product was then dissolved in 10 mL CH2Cl2, plus a few drops of methanol, then loaded onto a 40 g Isco RediSep normal phase silica cartridge, and purified on an Isco OptiX10 CombiFlash instrument using a gradient that started at 100% methylene chloride and ended at 90% methylene chloride, 9% methanol, 1% concentrated ammonium hydroxide. Fractions containing desired product were pooled and concentrated under reduced pressure. Yield of 38: 140 mg (100%). 1H NMR (400 MHz, CDCl3) δ 1.67 (m, 2H), 1.84 (m, 2H), 2.67 (m, 1H), 2.74 (m, 2H), 3.18 (m, 2H), 5.03 (s, 2H), 6.44 (d, J=5.2 Hz, 1H), 6.77 (d, J=7.2 Hz, 1H), 7.05 (t, J=8.8 Hz, 2H), 7.43 (bs, 1H), 7.56 (m, 2H), 8.04 (d, J=5.2 Hz, 1H), 9.36 (d, J=7.2 Hz, 1H). MS (ESI+) 389.2.

Provenance & Evidence