Hydrochloric Acid → HCID 131730432, compound

HRID 1963479Notes

Reaction equation

HRID 1963479 reaction equation
C([O:3][C:4](=O)[CH2:5][C:6]([C@@H:8]1[CH2:13][CH2:12][N:11]([C:14]([O:16][CH3:17])=[O:15])[C@@H:10]([C:18]2[CH:23]=[CH:22][C:21]([C:24]([F:27])([F:26])[F:25])=[CH:20][C:19]=2[F:28])[CH2:9]1)=[O:7])C.[OH-].[Na+].[NH2:32]O.Cl>CO>[F:28][C:19]1[CH:20]=[C:21]([C:24]([F:27])([F:26])[F:25])[CH:22]=[CH:23][C:18]=1[C@H:10]1[CH2:9][C@H:8]([C:6]2[O:7][NH:32][C:4](=[O:3])[CH:5]=2)[CH2:13][CH2:12][N:11]1[C:14]([O:16][CH3:17])=[O:15]

Participants

6

Reactant 4

HCID 313Hydrochloric AcidHCID 787HydroxylamineHCID 14798Sodium HydroxideHCID 131730433trans-Methyl 4-(3-ethoxy-3-oxopropanoyl)-2-(2-fluoro-4-(trifluoromethyl)phenyl)piperidine-1-carboxylate

Product 1

HCID 131730432HCID 131730432, compoundYield 99.5%

Reagents, catalysts & solvents 1

HCID 887MethanolSolvent

Conditions

Temperature
-45 °C

Procedure

Trans-methyl 4-(3-ethoxy-3-oxopropanoyl)-2-(2-fluoro-4-(trifluoromethyl)phenyl)piperidine-1-carboxylate (430 mg, 1.03 mmol) (from example 73, step 1) was dissolved in MeOH (3 mL) and cooled to −45° C. under nitrogen. Sodium hydroxide (0.302 mL, 1.03 mmol) was added during 10 min and the yellow solution continued to stir at −45° C. for 20 min. Hydroxylamine (50% by weight in water, 0.063 mL, 1.03 mmol) was added during 8 min. The resulting solution was stirred at −45° C. for 3 h. The mixture was then rapidly poured into a prewarmed (80° C.) solution of 6 M hydrogen chloride (5.28 mL, 31.68 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 a slightly yellow oil. Crude trans-methyl 2-(2-fluoro-4-(trifluoromethyl)phenyl)-4-(3-oxo-2,3-dihydroisoxazol-5-yl)piperidine-1-carboxylate (398 mg, quant.) was isolated. MS m/z 387 (M−H)−

Workup

  1. stirringThe resulting solution was stirred at −45° C. for 3 h
  2. stirringto stir at 80° C. for 20 min
  3. customThe solvent was evaporated
  4. additionDCM/water added
  5. customThe phases were separated
  6. customevaporated
  7. customto yield a slightly yellow oil

Sources & evidence

ORD record
ord-7fd3daadd9d34b1a870e51de67614661
Source dataset
uspto-grants-2013_04
Patent number
US08415378B2

Reaction notes

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