Ammonium Chloride → N-(3-Azido-5-fluoropyridin-2-yl)-2,2-dimethylpropanamide

HRID 1768187Notes

Reaction equation

HRID 1768187 reaction equation
[F:1][C:2]1[CH:3]=[CH:4][C:5]([NH:8][C:9](=[O:14])[C:10]([CH3:13])([CH3:12])[CH3:11])=[N:6][CH:7]=1.C([Li])(C)(C)C.C(C1C=CC(S([N:41]=[N+:42]=[N-:43])(=O)=O)=CC=1)CCCCCCCCCCC.[NH4+].[Cl-]>O1CCCC1>[N:41]([C:4]1[C:5]([NH:8][C:9](=[O:14])[C:10]([CH3:11])([CH3:13])[CH3:12])=[N:6][CH:7]=[C:2]([F:1])[CH:3]=1)=[N+:42]=[N-:43]

Participants

6

Reactant 4

HCID 25517Ammonium ChlorideHCID 109151434-Dodecylbenzenesulfonyl azideHCID 22293237N-(5-Fluoropyridin-2-yl)pivalamideHCID 178418306HCID 178418306, compound

Product 1

HCID 22293288N-(3-Azido-5-fluoropyridin-2-yl)-2,2-dimethylpropanamideYield 17%

Reagents, catalysts & solvents 1

HCID 8028TetrahydrofuranSolvent

Procedure

To a −78° C. solution of N-(5-fluoropyridin-2-yl)-2,2-dimethylpropanamide (1.34 g, 6.83 mmol) in tetrahydrofuran (25 mL) was added tert-butyllithium (1.31 mL of a 1.7 M solution, 20.5 mmol) drop wise. After 3 h at −78° C., 4-dodecylbenzenesulfonyl azide (3.60 g, 10.2 mmol) was added at the reaction was allowed to warm to room temperature. After 1 h, saturated aqueous NH4Cl was added, and the tetrahydrofuran was removed via rotary evaporator. Dichloromethane was added, the layers separated and the aqueous phase backwashed with DCM. The combined organics were dried over magnesium sulfate, filtered and concentrated and the residue purified by two successive silica gel chromatographies (10%→80% EtOAc/hexanes, then 5%→42% EtOAc/hexanes) to give the title compound (0.275 g). MS 234.0 (M+1).

Workup

  1. waitAfter 1 h
  2. customthe tetrahydrofuran was removed via rotary evaporator
  3. additionDichloromethane was added
  4. customthe layers separated
  5. dry with materialThe combined organics were dried over magnesium sulfate
  6. filtrationfiltered
  7. concentrationconcentrated
  8. customthe residue purified by two successive silica gel chromatographies (10%→80% EtOAc/hexanes

Sources & evidence

ORD record
ord-055324ab52024e7193ef62c7fa1bcb0d
Source dataset
uspto-grants-2007_06
Patent number
US07235545B2

Reaction notes

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