2,2,2-trifluoroethanethiol

Conditions: temp:0.00; pressure:0.00; stir:

Conditions: temp:0.00; pressure:0.00; stir:

Conditions: temp:0.00; pressure:0.00; stir:

Conditions: temp:0.00; pressure:0.00; stir:

Conditions: temp:0.00; pressure:0.00; stir:

Conditions: temp:0.00; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: 2,2,2-Trifluoroethane-1-thiol (471 μL, 3.41 mmol) was added dropwise to a suspension of sodium hydride (60% dispersion in mineral oil, 0.065 g, 1.636 mmol) in dry DMF (10 mL) at 0 C and the mixture was stirred for 15 min. A solution of tert-butyl 4-[(methanesulfonyloxy)methyl]piperidine-1-carboxylate (prepared in an analogous manner to Intermediate 181, 1 g, 3.41 mmol) in DMF (5 mL) was added dropwise and the mixture was stirred at room temperature for 5 h. The reaction mixture was diluted with water (50 mL) and extracted with EtOAc (3×50 mL). The combined organic layers were washed with saturated aq. sodium bicarbonate (25 mL) then brine (25 mL), dried over magnesium sulfate and concentrated under reduced pressure to provide the title compound as a light yellow oil (1.13 g, quant.). Method B HPLC-MS: MH+ requires m/z=314 Found: m/z=258 (MH+-tBu), Rt=2.39 min (98%). was added dropwise the mixture was stirred at room temperature for 5 h extracted with EtOAc (3×50 mL) The combined organic layers were washed with saturated aq. sodium bicarbonate (25 mL) brine (25 mL), dried over magnesium sulfate concentrated under reduced pressure

Conditions: temp:0.00; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: To a solution of sodium hydride (60% dispersion in mineral oil, 90 mg, 2.25 mmol) in anhydrous THF (40 mL) at 0 C was added 2,2,2-trifluoro-ethanethiol (200 μL, 2.25 mmol) drop-wise under nitrogen. The resulting solution was stirred for 15 min and added to a solution of 6-chloro-nicotinic acid methyl ester (257 mg, 1.5 mmol) in anhydrous THF (40 mL) at 0 C drop-wise. The reaction mixture was allowed to warm to room temperature and stirring was continued for a further 3 h. The solution was quenched with water at 0 C and extracted into EtOAc (3×50 mL). Combined organics were washed with brine (20 mL), dried over magnesium sulfate, evaporated to dryness and purified by silica chromatography (25% EtOAc in heptane) to afford the title compound as a colourless oil (370 mg, 98%). Method C HPLC-MS: MH+ requires m/z=252. Found: m/z=252, Rt=1.41 min (94%). stirring was continued for a further 3 h The solution was quenched with water at 0 C extracted into EtOAc (3×50 mL) Combined organics were washed with brine (20 mL) dried over magnesium sulfate evaporated to dryness purified by silica chromatography (25% EtOAc in heptane)

Conditions: temp:0.00; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: 2,2,2-Trifluoroethane-1-thiol (0.151 mL, 1.636 mmol) was added dropwise to a suspension of sodium hydride (60% dispersion in mineral oil, 0.065 g, 1.636 mmol) in anhydrous DMF (3 mL) at 0 C. A solution of tert-butyl 4-[(methanesulfonyloxy)methyl]piperidine-1-carboxylate (Intermediate 181, 0.320 g, 1.091 mmol) in DMF (4 mL) was then added dropwise and the reaction mixture was stirred at room temperature for 4 h. The mixture was diluted with EtOAc (30 mL) and washed with a saturated aqueous solution of sodium bicarbonate (10 mL) followed by brine (10 mL). The organic layer was dried over anhydrous sodium sulfate, filtered and evaporated under reduced pressure. The crude material was purified by FCC (EtOAc: heptane, 20:80) to provide the title compound as a colourless oil (0.288 g, 82%). Method B HPLC-MS: MH+ requires m/z=313 Found: m/z=257 (M minus tert-butyl), Rt=2.28 min (97%). washed with a saturated aqueous solution of sodium bicarbonate (10 mL) The organic layer was dried over anhydrous sodium sulfate filtered evaporated under reduced pressure The crude material was purified by FCC (EtOAc: heptane, 20:80)

Conditions: temp:0.00; pressure:0.00; stir:

Conditions: temp:0.00; pressure:0.00; stir:

Conditions: temp:5.01; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: 0.8 g of 2,2,2-trifluoroethylmercaptan was added dropwise under cooling with ice to a mixture of 1.6 g of 4-(3-nitro-1,2,4-triazolyl)-2-fluorobenzaldehyde, 1.3 g of potassium carbonate and 50 ml of N,N-dimethylformamide, followed by stirring at from 0 to 10° C. for 4 hours. The mixture was concentrated under reduced pressure, 200 ml of water was added, and the mixture was extracted with ethyl acetate. The organic layer was washed with water and dried over anhydrous magnesium sulfate. The solvent was distilled off under reduced pressure to obtain 1.8 g of 4-(3-nitro-1,2,4-triazolyl)-2-(2,2,2-trifluoroethylthio)benzaldehyde. The mixture was concentrated under reduced pressure, 200 ml of water was added the mixture was extracted with ethyl acetate The organic layer was washed with water dried over anhydrous magnesium sulfate The solvent was distilled off under reduced pressure

Conditions: temp:5.01; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: 0.8 g of 2,2,2-trifluoroethylmercaptan was added dropwise under cooling with ice to a mixture of 1.6 g of 4-(3-nitro-1,2,4-triazolyl)-2-fluorobenzaldehyde, 1.3 g of potassium carbonate and 50 ml of N,N-dimethylformamide, followed by stirring at from 0 to 10° C. for 4 hours. The mixture was concentrated under reduced pressure, 200 ml of water was added, and the mixture was extracted with ethyl acetate. The organic layer was washed with water and dried over anhydrous magnesium sulfate. The solvent was distilled off under reduced pressure to obtain 1.8 g of 4-(3-nitro-1,2,4-triazolyl)-2-(2,2,2-trifluoroethylthio)benzaldehyde. The mixture was concentrated under reduced pressure, 200 ml of water was added the mixture was extracted with ethyl acetate The organic layer was washed with water dried over anhydrous magnesium sulfate The solvent was distilled off under reduced pressure