[CH:1]1([SH:6])[CH2:5][CH2:4][CH2:3][CH2:2]1.CC(C)([O-])C.[K+].Cl[C:14]1[N+:19]([O-:20])=[C:18]2[CH2:21][CH2:22][CH2:23][C:17]2=[C:16]([Cl:24])[CH:15]=1>O1CCOCC1.C(Cl)Cl>[Cl:24][C:16]1[CH:15]=[C:14]([S:6][CH:1]2[CH2:5][CH2:4][CH2:3][CH2:2]2)[N+:19]([O-:20])=[C:18]2[CH2:21][CH2:22][CH2:23][C:17]=12
To a solution of cyclopentyl mercaptan (0.112 g, 1.10 mmol) in dioxane (4 mL) at rt was added potassium tert-butoxide (0.100 g, 0.88 mmol). The mixture was stirred at rt for 1 h. After this time, 2,4-dichloro-6,7-dihydro-5H-cyclopenta[b]pyridine 1-oxide (0.150 g, 0.74 mmol) in dioxane (1 mL) was added and the mixture was heated to 100° C. for 1 h. Then, the mixture was diluted with methylene chloride and washed with water. The organic layer were dried over anhydrous sodium sulfate, filtered, and the filtrate was concentrated. The residue was purified by column chromatography (silica, dichloromethane/methanol) to afford the title compound (0.170 g, 86%) as a brown oil. MW=269.79. 1H NMR (CDCl3, 500 MHz) δ 6.99 (s, 1H) 3.60-3.52 (m, 1H), 3.22 (t, J=7.5 Hz, 2H), 3.01 (t, J=7.5 Hz, 2H), 2.26-2.15 (m, 4H), 1.88-1.79 (m, 2H), 1.77-1.64 (m, 4H); APCI MS m/z 270 [M+H]+.
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