Cyclopentanethiol → 4-chloro-2-(cyclopentylthio)-6,7-dihydro-5H-cyclopenta[b]pyridine 1-oxide

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]+.

1. temperaturethe mixture was heated to 100° C. for 1 h
2. washwashed with water
3. dry with materialThe organic layer were dried over anhydrous sodium sulfate
4. filtrationfiltered
5. concentrationthe filtrate was concentrated
6. customThe residue was purified by column chromatography (silica, dichloromethane/methanol)

ORD record

ord-203af98f66ac40ec8d35b0c36562b751

Source dataset

uspto-grants-2015_12

DOI

10.6084/m9.figshare.5104873.v1

Patent number

US09221843B2