Phosphorus trichloride → 4-chloro-2-(cyclopentylthio)-6,7-dihydro-5H-cyclopenta[b]pyridine

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Reaction Steps

To a solution of 4-chloro-2-(cyclopentylthio)-6,7-dihydro-5H-cyclopenta[b]pyridine 1-oxide (0.160 g, 0.59 mmol) in methylene chloride (10 mL) was added phosphorous trichloride (0.1 mL, 0.89 mmol). The mixture stirred at rt for 2 h. After this time, the mixture was quenched with a saturated solution of NaHCO3 and extracted with methylene chloride. The organic layer was dried over anhydrous sodium sulfate, filtered, and the filtrate was concentrated. The residue was purified by column chromatography (silica, hexanes/ethyl acetate) to afford the title compound (0.137 g, 91%) as a clear oil. MW=253.79. 1H NMR (CDCl3, 500 MHz) δ 6.96 (s, 1H) 3.98-3.90 (m, 1H), 3.02 (t, J=7.5 Hz, 2H), 2.93 (t, J=7.5 Hz, 2H), 2.22-2.08 (m, 4H), 1.83-1.72 (m, 2H), 1.68-1.58 (4H); APCI MS m/z 254 [M+H]+.

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