Benzylamine → tert-Butyl 1-[3-(benzylamino)-4-fluorobenzyl]cyclopropanecarboxylate

HRID 1475619Notes

Reaction equation

HRID 1475619 reaction equation
Br[C:2]1[CH:3]=[C:4]([CH:16]=[CH:17][C:18]=1[F:19])[CH2:5][C:6]1([C:9]([O:11][C:12]([CH3:15])([CH3:14])[CH3:13])=[O:10])[CH2:8][CH2:7]1.[CH2:20]([NH2:27])[C:21]1[CH:26]=[CH:25][CH:24]=[CH:23][CH:22]=1.CC(C)([O-])C.[Na+].C1(P(C2C=CC=CC=2)C2C=CC3C(=CC=CC=3)C=2C2C3C(=CC=CC=3)C=CC=2P(C2C=CC=CC=2)C2C=CC=CC=2)C=CC=CC=1.[Cl-].[NH4+]>C1(C)C=CC=CC=1.C1C=CC(/C=C/C(/C=C/C2C=CC=CC=2)=O)=CC=1.C1C=CC(/C=C/C(/C=C/C2C=CC=CC=2)=O)=CC=1.C1C=CC(/C=C/C(/C=C/C2C=CC=CC=2)=O)=CC=1.[Pd].[Pd].C(OCC)(=O)C>[CH2:20]([NH:27][C:2]1[CH:3]=[C:4]([CH:16]=[CH:17][C:18]=1[F:19])[CH2:5][C:6]1([C:9]([O:11][C:12]([CH3:15])([CH3:14])[CH3:13])=[O:10])[CH2:8][CH2:7]1)[C:21]1[CH:26]=[CH:25][CH:24]=[CH:23][CH:22]=1

Participants

9

Reactant 5

HCID 7504BenzylamineHCID 25517Ammonium ChlorideHCID 634876Binap, (A+-)-HCID 23676156Sodium t-butoxideHCID 58136672tert-Butyl 1-(3-bromo-4-fluorobenzyl)cyclopropanecarboxylate

Product 1

HCID 58136659tert-Butyl 1-[3-(benzylamino)-4-fluorobenzyl]cyclopropanecarboxylate

Reagents, catalysts & solvents 3

HCID 9811564Bis(dibenzylideneacetone)palladiumCatalystHCID 1140TolueneSolventHCID 8857Ethyl AcetateSolvent

Conditions

Temperature
110 °C

Procedure

Under argon and dry conditions, 174.0 g (528.5 mmol) of tert-butyl 1-(3-bromo-4-fluorobenzyl)cyclopropanecarboxylate, 69.2 ml (634.2 mmol) of benzylamine, 4.84 g (5.29 mmol) of tris(dibenzylideneacetone)dipalladium, 60.95 g (634.2 mmol) of sodium tert-butoxide and 3.29 g (5.29 mmol) of (+/−)-2,2′-bis(diphenylphosphino)-1,1′-binaphthyl were suspended in 1218 ml of toluene. The reaction mixture was then stirred at 110° C. for 2.0 h. After cooling, 2.1 liters of ethyl acetate and 1.7 liters of semisaturated aqueous ammonium chloride solution were added to the reaction mixture. After phase separation, the organic phase was washed with saturated ammonium chloride solution and saturated sodium chloride solution, dried over magnesium sulphate and concentrated under reduced pressure. The crude product was purified by chromatography on 3.7 kg of silica gel (mobile phase petroleum ether/ethyl acetate 20:1). This gave 145.0 g (68.7% of theory) of the title compound.

Workup

  1. temperatureAfter cooling
  2. customAfter phase separation
  3. washthe organic phase was washed with saturated ammonium chloride solution and saturated sodium chloride solution
  4. dry with materialdried over magnesium sulphate
  5. concentrationconcentrated under reduced pressure
  6. customThe crude product was purified by chromatography on 3.7 kg of silica gel (mobile phase petroleum ether/ethyl acetate 20:1)

Sources & evidence

ORD record
ord-2dc7b805ce9a42cdbf484e18369b4ae7
Source dataset
uspto-grants-2015_04
Patent number
US09018258B2

Reaction notes

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