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Diisopropylethylamine → tert-butyl [(1S)-2-({6-[(2,4-dihydroxyphenyl)carbamoyl]-5-fluoropyridin-3-yl}oxy)-1-methylethyl]carbamate

HRID 1026346
Notes
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Reaction equation

HRID 1026346 reaction equation
[C:1]([O:5][C:6]([NH:8][C@@H:9]([CH3:22])[CH2:10][O:11][C:12]1[CH:13]=[C:14]([F:21])[C:15]([C:18]([OH:20])=O)=[N:16][CH:17]=1)=[O:7])([CH3:4])([CH3:3])[CH3:2].Cl.[NH2:24][C:25]1[CH:30]=[CH:29][C:28]([OH:31])=[CH:27][C:26]=1[OH:32].CN(C(ON1N=NC2C=CC=NC1=2)=[N+](C)C)C.F[P-](F)(F)(F)(F)F.C(N(CC)C(C)C)(C)C>O.CN(C=O)C>[OH:32][C:26]1[CH:27]=[C:28]([OH:31])[CH:29]=[CH:30][C:25]=1[NH:24][C:18]([C:15]1[N:16]=[CH:17][C:12]([O:11][CH2:10][C@@H:9]([NH:8][C:6](=[O:7])[O:5][C:1]([CH3:2])([CH3:3])[CH3:4])[CH3:22])=[CH:13][C:14]=1[F:21])=[O:20]
ParticipantsProcedureWorkupSources & evidenceReaction notes

Participants

7

Reactant 4

HCID 81531DiisopropylethylamineHCID 9886157Methanaminium, N-((dimethylamino)(3H-1,2,3-triazolo(4,5-b)pyridin-3-yloxy)methylene)-N-methyl-, hexafluorophosphate(1-) (1:1)HCID 134088224-Aminobenzene-1,3-diol hydrochlorideHCID 677781795-({(2S)-2-[(tert-butoxycarbonyl)amino]propyl}oxy)-3-fluoropyridine-2-carboxylic acid

Product 1

HCID 86666268
tert-butyl [(1S)-2-({6-[(2,4-dihydroxyphenyl)carbamoyl]-5-fluoropyridin-3-yl}oxy)-1-methylethyl]carbamate
Yield 37.4%

Reagents, catalysts & solvents 2

HCID 962WaterSolventHCID 6228DimethylformamideSolvent

Procedure

A mixture of 5-({(2S)-2-[(tert-butoxycarbonyl)amino]propyl}oxy)-3-fluoropyridine-2-carboxylic acid (5.00 g), 4-aminobenzene-1,3-diol hydrochloride (2.57 g), HATU (6.05 g), N,N-diisopropylethylamine (5.56 mL), and DMF (50 mL) was stirred at room temperature overnight. Water was added, and the mixture was extracted with ethyl acetate. The organic layer was separated, washed with brine, dried over anhydrous magnesium sulfate and concentrated under reduced pressure. The residue was purified by silica gel column chromatography (hexane/ethyl acetate) to give tert-butyl [(1S)-2-({6-[(2,4-dihydroxyphenyl)carbamoyl]-5-fluoropyridin-3-yl}oxy)-1-methylethyl]carbamate (2.51 g) as a mixture with impurities. Triethylamine (6.64 mL) was added to a solution of hexachloroethane (3.53 g) and triphenylphosphine (4.69 g) in acetonitrile (25 mL) at room temperature. The mixture was stirred at room temperature for 10 min. Then a mixture of tert-butyl [(1S)-2-({6-[(2,4-dihydroxyphenyl)carbamoyl]-5-fluoropyridin-3-yl}oxy)-1-methylethyl]carbamate (2.51 g, a mixture with impurities) and acetonitrile (25 mL) was added, and the mixture was stirred at room temperature overnight. Water was added, and the mixture was extracted with ethyl acetate. The organic layer was washed with brine, dried over anhydrous magnesium sulfate and concentrated under reduced pressure. The residue was purified by silica gel column chromatography (hexane/ethyl acetate) to give the title compound (0.770 g) as a pale yellow solid.

Workup

  1. extractionthe mixture was extracted with ethyl acetate
  2. customThe organic layer was separated
  3. washwashed with brine
  4. dry with materialdried over anhydrous magnesium sulfate
  5. concentrationconcentrated under reduced pressure
  6. customThe residue was purified by silica gel column chromatography (hexane/ethyl acetate)

Sources & evidence

ORD record
ord-5af0e04c5f65432889e5d86e0e692aa5
Source dataset
uspto-grants-2014_05
DOI
10.6084/m9.figshare.5104873.v1
Patent number
US08729102B2

Reaction notes

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