2-Methyl-3-butyn-2-ol → 4-(5-Chloro-3-nitro-pyridin-2-yl)-2-methyl-but-3-yn-2-ol

HRID 418981Notes

Reaction equation

HRID 418981 reaction equation
Br[C:2]1[C:7]([N+:8]([O-:10])=[O:9])=[CH:6][C:5]([Cl:11])=[CH:4][N:3]=1.[CH3:12][C:13]([OH:17])([C:15]#[CH:16])[CH3:14].CN1CCCC1=O.CCN(CC)CC>[Cu]I.C1C=CC([P]([Pd]([P](C2C=CC=CC=2)(C2C=CC=CC=2)C2C=CC=CC=2)([P](C2C=CC=CC=2)(C2C=CC=CC=2)C2C=CC=CC=2)[P](C2C=CC=CC=2)(C2C=CC=CC=2)C2C=CC=CC=2)(C2C=CC=CC=2)C2C=CC=CC=2)=CC=1.O>[Cl:11][C:5]1[CH:6]=[C:7]([N+:8]([O-:10])=[O:9])[C:2]([C:16]#[C:15][C:13]([CH3:14])([OH:17])[CH3:12])=[N:3][CH:4]=1

Participants

8

Reactant 4

HCID 82582-Methyl-3-butyn-2-olHCID 8471TriethylamineHCID 13387N-methyl-2-pyrrolidoneHCID 2806812-Bromo-5-chloro-3-nitropyridine

Product 1

HCID 579425324-(5-Chloro-3-nitro-pyridin-2-yl)-2-methyl-but-3-yn-2-ol

Reagents, catalysts & solvents 3

HCID 24350Copper(1+) iodide; Copper(I) iodide; Cuprous iodide; Cuprous iodide (CuI)CatalystHCID 178418397HCID 178418397, compoundCatalystHCID 962WaterSolvent

Procedure

To a mixture of 2-bromo-5-chloro-3-nitro-pyridine (2.5 g, 10.6 mmol), CuI (141 mg, 0.74 mmol), Pd(PPh3)4, (367 mg, 0.32 mmol) and 2-Methyl-3-butyn-2-ol (1.5 mL, 15.8 mmol) was added 1-methyl-2-pyrrolidone (20 mL) followed by Et3N (6 mL, 22 mmol). After stirring for 4 h 30 min at room temperature, the reaction mixture was poured into water (20 mL) and extracted with EtOAc (3×30 mL). The combined organic extracts were washed with brine (20 mL), dried (Na2SO4), filtered and concentrated under reduced pressure, and the residue was purified by flash column chromatography over silica gel (EtOAc/Hexanes, 2:98, then 5:95) to provide 4-(5-chloro-3-nitro-pyridin-2-yl)-2-methyl-but-3-yn-2-ol. MS m/z: 241.0 (M+H).

Workup

  1. extractionextracted with EtOAc (3×30 mL)
  2. washThe combined organic extracts were washed with brine (20 mL)
  3. dry with materialdried (Na2SO4)
  4. filtrationfiltered
  5. concentrationconcentrated under reduced pressure
  6. customthe residue was purified by flash column chromatography over silica gel (EtOAc/Hexanes, 2:98

Sources & evidence

ORD record
ord-389825f5863341e7a7f56a1047613b49
Source dataset
uspto-grants-2012_01
Patent number
US08093247B2

Reaction notes

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