Trimethylsilylacetylene → 3-Ethynyl-5-fluoropyridin-2-amine

HRID 1891892Notes

Reaction equation

HRID 1891892 reaction equation
[F:1][C:2]1[CH:3]=[C:4](I)[C:5]([NH2:8])=[N:6][CH:7]=1.C[Si]([C:14]#[CH:15])(C)C.C(N(CC)C(C)C)(C)C>[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.CN1CCCC1=O>[C:14]([C:4]1[C:5]([NH2:8])=[N:6][CH:7]=[C:2]([F:1])[CH:3]=1)#[CH:15]

Participants

7

Reactant 3

HCID 66111TrimethylsilylacetyleneHCID 81531DiisopropylethylamineHCID 184559742-Amino-5-fluoro-3-iodopyridine

Product 1

HCID 552886203-Ethynyl-5-fluoropyridin-2-amineYield 30%

Reagents, catalysts & solvents 3

HCID 24350Copper(1+) iodide; Copper(I) iodide; Cuprous iodide; Cuprous iodide (CuI)CatalystHCID 178418397HCID 178418397, compoundCatalystHCID 13387N-methyl-2-pyrrolidoneSolvent

Conditions

Temperature
70 °C

Procedure

To a mixture of 5-fluoro-3-iodo-pyridin-2-ylamine (751 mg, 3.16 mmol) described in Manufacturing Example 173-1-1, trimethylsilylacetylene (874 μL, 6.32 mmol), copper (I) iodide (60.2 mg, 0.32 mmol), N,N-diisopropylethylamine (1.07 mL, 6.32 mmol), and N-methylpyrrolidinone (15 mL) was added tetrakis(triphenylphosphine)palladium(0) (183 mg, 0.16 mmol), which was stirred for 3 hours under nitrogen atmosphere at 70° C. This reaction solution was cooled to room temperature, and then partitioned into ethyl acetate and water. The organic layer was separated, washed with water and saturated aqueous sodium chloride, dried over anhydrous magnesium sulfate, and filtered. The filtrate was concentrated under a reduced pressure, and the residue thus obtained was purified by NH silica gel column chromatography and then silica gel column chromatography (heptane:ethyl acetate=1:1) to obtain the title compound (129 mg, 30%).

Workup

  1. temperatureThis reaction solution was cooled to room temperature
  2. custompartitioned into ethyl acetate and water
  3. customThe organic layer was separated
  4. washwashed with water and saturated aqueous sodium chloride
  5. dry with materialdried over anhydrous magnesium sulfate
  6. filtrationfiltered
  7. concentrationThe filtrate was concentrated under a reduced pressure
  8. customthe residue thus obtained
  9. customwas purified by NH silica gel column chromatography

Sources & evidence

ORD record
ord-fa44d1a36d9f4c4d9492e615941b805e
Source dataset
uspto-grants-2013_08
Patent number
US08507530B2

Reaction notes

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