Diisopropylethylamine → tert-Butyl N-[(1S,2S)-2-{[3-fluoro-5-(trifluoromethyl)pyridin-2-yl]amino}cyclopentyl]carbamate

HRID 1750525Notes

Reaction equation

HRID 1750525 reaction equation
[NH2:1][C@H:2]1[CH2:6][CH2:5][CH2:4][C@@H:3]1[NH:7][C:8](=[O:14])[O:9][C:10]([CH3:13])([CH3:12])[CH3:11].F[C:16]1[C:21]([F:22])=[CH:20][C:19]([C:23]([F:26])([F:25])[F:24])=[CH:18][N:17]=1.CCN(C(C)C)C(C)C>CS(C)=O>[F:22][C:21]1[C:16]([NH:1][C@H:2]2[CH2:6][CH2:5][CH2:4][C@@H:3]2[NH:7][C:8](=[O:14])[O:9][C:10]([CH3:11])([CH3:13])[CH3:12])=[N:17][CH:18]=[C:19]([C:23]([F:25])([F:24])[F:26])[CH:20]=1

Participants

5

Reactant 3

HCID 81531DiisopropylethylamineHCID 134215472,3-Difluoro-5-(trifluoromethyl)pyridineHCID 17040218(1S,2S)-trans-N-Boc-1,2-cyclopentanediamine

Product 1

HCID 118308336tert-Butyl N-[(1S,2S)-2-{[3-fluoro-5-(trifluoromethyl)pyridin-2-yl]amino}cyclopentyl]carbamate

Reagents, catalysts & solvents 1

HCID 679Dimethyl SulfoxideSolvent

Procedure

A solution of tert-butyl N-[(1S,2S)-2-aminocyclopentyl]carbamate (CAS number 586961-34-4; 2 g, 9.99 mmol), 2,3-difluoro-5-(trifluoromethyl)pyridine (CAS number 89402-42-6; 2.011 g, 10.98 mmol) and DIPEA (1.744 ml, 9.99 mmol) in DMSO (35 ml) was heated at 140° C. for 5 hours. The reaction was partitioned between ethyl acetate and water. The phases were separated and the aqueous layer was re-extracted with ethyl acetate (2×50 ml). The combined organics were washed with brine (50 ml), filtered through a hydrophobic frit and concentrated in vacuo. The crude product was purified by column chromatography (0-15% ethyl acetate/petrol) to afford the title compound.

Workup

  1. customThe reaction was partitioned between ethyl acetate and water
  2. customThe phases were separated
  3. extractionthe aqueous layer was re-extracted with ethyl acetate (2×50 ml)
  4. washThe combined organics were washed with brine (50 ml)
  5. filtrationfiltered through a hydrophobic frit
  6. concentrationconcentrated in vacuo
  7. customThe crude product was purified by column chromatography (0-15% ethyl acetate/petrol)

Sources & evidence

ORD record
ord-9933475754e24f298568efc18761224a
Source dataset
uspto-grants-2015_10
Patent number
US09156829B2

Reaction notes

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