Diisopropylethylamine → 5-(3-Fluoro-phenylethynyl)-pyridine-2-carboxylic acid tert-butyl-ethyl-amide

HRID 2199412Notes

Reaction equation

HRID 2199412 reaction equation
[F:1][C:2]1[CH:3]=[C:4]([C:8]#[C:9][C:10]2[CH:11]=[CH:12][C:13]([C:16]([OH:18])=O)=[N:14][CH:15]=2)[CH:5]=[CH:6][CH:7]=1.CCN(C(C)C)C(C)C.[C:28]([NH:32][CH2:33][CH3:34])([CH3:31])([CH3:30])[CH3:29].CN(C(ON1N=NC2C=CC=CC1=2)=[N+](C)C)C.[B-](F)(F)(F)F>O1CCOCC1>[C:28]([N:32]([CH2:33][CH3:34])[C:16]([C:13]1[CH:12]=[CH:11][C:10]([C:9]#[C:8][C:4]2[CH:5]=[CH:6][CH:7]=[C:2]([F:1])[CH:3]=2)=[CH:15][N:14]=1)=[O:18])([CH3:31])([CH3:30])[CH3:29]

Participants

6

Reactant 4

HCID 81531DiisopropylethylamineHCID 521156N-tert-ButylethylamineHCID 2733207O-(Benzotriazol-1-yl)-N,N,N',N'-tetramethyluronium tetrafluoroborateHCID 53384862HCID 53384862, compound

Product 1

HCID 736028105-(3-Fluoro-phenylethynyl)-pyridine-2-carboxylic acid tert-butyl-ethyl-amideYield 76.7%

Reagents, catalysts & solvents 1

HCID 312751,4-DioxaneSolvent

Procedure

(100 mg, 0.41 mmol) 5-(3-Fluoro-phenylethynyl)-pyridine-2-carboxylic acid (Example 1, step 2) was dissolved in dioxane (1 ml) and Hunig's Base (217 μl, 1.24 mmol, 3 equiv.), tert.-butylethylamine (63 mg, 0.62 mmol, 1.5 equiv.) and TBTU (146 mg, 0.45 mmol, 1.1 equiv.) were added at room temperature. The mixture was stirred for 16 hours at room temperature. The reaction mixture was evaporated and extracted saturated NaHCO3 solution and two times with a small volume of dichloromethane. The crude product was purified by flash chromatography by directly loading the dichloromethane layers onto a silica gel column and eluting with an ethyl acetate:heptane gradient 0:100 to 0:100. The desired 5-(3-fluoro-phenylethynyl)-pyridine-2-carboxylic acid tert-butyl-ethyl-amide (102 mg, 76% yield) was obtained as a light yellow oil, MS: m/e=325.3 (M+H+).

Workup

  1. customThe reaction mixture was evaporated
  2. extractionextracted saturated NaHCO3 solution and two times with a small volume of dichloromethane
  3. customThe crude product was purified by flash chromatography
  4. washeluting with an ethyl acetate

Sources & evidence

ORD record
ord-61549898245a41be9e6498ba466a0377
Source dataset
uspto-grants-2016_06
Patent number
US09359301B2

Reaction notes

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