Hydrochloric Acid → HCID 131730450, compound

Participants

Reaction Conditions

Reaction Steps

Trans-methyl 2-((4,4-difluorocyclohexyl)methyl)-4-(3-ethoxy-3-oxopropanoyl)piperidine-1-carboxylate (300 mg, 0.77 mmol) (from example 89, step 1) was dissolved in MeOH (3 mL) and cooled to −40° C. under nitrogen. Sodium hydroxide (0.227 mL, 0.77 mmol) dissolved in water (0.300 mL) was added during 10 min and the yellow solution continued to stir at −40° C. for 20 min. Hydroxylamine (50% by weight in water, 0.047 mL, 0.77 mmol) was added during 8 min. The resulting solution was stirred at −40° C. for 3 h 15 min. The mixture was then rapidly poured into a prewarmed (80° C.) solution of 6 M hydrogen chloride (4 mL, 24.00 mmol) and the mixture continued to stir at 80° C. for 20 min. The solvent was evaporated and DCM/water added. The phases were separated and the organic phase passed through a phase separator and evaporated to yield crude trans-methyl 2-((4,4-difluorocyclohexyl)methyl)-4-(3-oxo-2,3-dihydroisoxazol-5-yl)piperidine-1-carboxylate (267 mg, 97%) as a slightly yellow solid. MS m/z 357 (M−H)−

Provenance & Evidence