Hydrochloric Acid → HCID 66732297, compound

Participants

Reaction Steps

Methyl 2-(5-tert-butylthiophen-2-yl)isonicotinate (2.02 g, 7.34 mmol) was dissolved in hydrogen chloride (1.25 M in MeOH, 11.74 mL, 14.67 mmol) and stirred at room temperature for 30 min. The solvent was evaporated in vacuo. The residue was dissolved in MeOH (20 mL), platinum(IV) oxide (0.050 g, 0.22 mmol) added and the reaction mixture hydrogenated in a Büchi hydrogenator at 5 bar and room temperature for 3 h. Additional platinum(IV) oxide (0.050 g, 0.22 mmol) was added and the hydrogenation continued for 3 h. The reaction mixture was filtered through celite, washed with MeOH and the filtrate evaporated in vacuo. The residue was redissolved in MeOH (15 mL) and platinum(IV) oxide (0.167 g, 0.73 mmol) added. Hydrogenation was continued for 3 h. Additional platinum(IV) oxide (0.167 g, 0.73 mmol) was added and the hydrogenation continued for 2 h. The reaction mixture was filtered through celite, washed with MeOH and the filtrate evaporated in vacuo to yield methyl 2-(5-tert-butylthiophen-2-yl)piperidine-4-carboxylate hydrochloride (2.360 g, 101%) as a black oil. MS m/z 282 (M+H)+

Provenance & Evidence