Methane → (S)-5,7-difluoro-1,2,3,4-tetrahydronaphthalen-2-ylamine hydrochloride

HRID 1755786Notes

Reaction equation

HRID 1755786 reaction equation
O.[OH-].[Li+].[F:4][C:5]1[CH:14]=[C:13]([F:15])[CH:12]=[C:11]2[C:6]=1[CH2:7][CH2:8][C@H:9]([NH:16]C(=O)C(F)(F)F)[CH2:10]2.[ClH:23].C>CO.O>[ClH:23].[F:4][C:5]1[CH:14]=[C:13]([F:15])[CH:12]=[C:11]2[C:6]=1[CH2:7][CH2:8][C@H:9]([NH2:16])[CH2:10]2

Participants

7

Reactant 4

HCID 297MethaneHCID 313Hydrochloric AcidHCID 168937Lithium hydroxide, monohydrateHCID 15290004(S)-5,7-difluoro-2-[(trifluoroacetyl)amino]-1,2,3,4-tetrahydronaphthalene

Product 1

HCID 66789737(S)-5,7-difluoro-1,2,3,4-tetrahydronaphthalen-2-ylamine hydrochloride

Reagents, catalysts & solvents 2

HCID 887MethanolSolvent3×HCID 962WaterSolvent2×

Procedure

Lithium hydroxide monohydrate (7.8 g, 0.2 mol) was added to a solution of (S)-5,7-difluoro-2-[(trifluoroacetyl)amino]-1,2,3,4-tetrahydronaphthalene (20.8 g, 74.5 mmol), prepared as in Example 5, in 187 mL of methanol and 21 mL of water. The mixture was stirred at reflux for 30 minutes and diluted with 200 mL of methanol. The diluted mixture then was combined with 60 mL of water, 24.8 mL of concentrated hydrochloric acid and 4.2 g of activated carbon, Darco®. The mixture was stirred for 30 minutes and then filtered through celite. The filtrate was distilled until the head temperature reached 75° C. The remaining mixture was allowed to cool and let stand for approximately 60 hours. The mixture then was cooled in an ice bath giving a crystalline material. The material was isolated by filtration and the filter residue was washed with water. Drying to constant weight in vacuo at room temperature under a nitrogen stream gave (S)-5,7-difluoro-1,2,3,4-tetrahydronaphthalen-2-ylamine hydrochloride (14.8 g, 67.6 mol), m.p. >280° C. [α]D -66.2° (c=0.162, CH3OH).

Workup

  1. temperatureat reflux for 30 minutes
  2. stirringThe mixture was stirred for 30 minutes
  3. filtrationfiltered through celite
  4. distillationThe filtrate was distilled until the head temperature
  5. customreached 75° C
  6. temperatureto cool
  7. temperatureThe mixture then was cooled in an ice bath
  8. customgiving a crystalline material
  9. customThe material was isolated by filtration
  10. washthe filter residue was washed with water
  11. customDrying to constant weight in vacuo at room temperature under a nitrogen stream

Sources & evidence

ORD record
ord-69ffaeb546924d0e9807beeba9f71ec3
Source dataset
uspto-grants-1995_08
Patent number
US05438150

Reaction notes

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