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

HRID 78182Notes

Reaction equation

HRID 78182 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-3e278e38fcc7467d9d6271cd2f5431f7
Source dataset
uspto-grants-2014_09
Patent number
US08841327B2

Reaction notes

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