Nitrogen → 2-tert-Butylamino-4-[4-fluoro-phenylethynyl]pyrimidine

HRID 885636Notes

Reaction equation

HRID 885636 reaction equation
N#N.[C:3]([NH:7][C:8]1[N:13]=[C:12]([C:14]#[CH:15])[CH:11]=[CH:10][N:9]=1)([CH3:6])([CH3:5])[CH3:4].I[C:17]1[CH:22]=[CH:21][C:20]([F:23])=[CH:19][CH:18]=1>CCN(CC)CC.C1COCC1.[Cu]I>[C:3]([NH:7][C:8]1[N:13]=[C:12]([C:14]#[C:15][C:17]2[CH:22]=[CH:21][C:20]([F:23])=[CH:19][CH:18]=2)[CH:11]=[CH:10][N:9]=1)([CH3:6])([CH3:5])[CH3:4]

Participants

7

Reactant 3

HCID 947NitrogenHCID 96054-FluoroiodobenzeneHCID 12165235N-tert-butyl-4-ethynylpyrimidin-2-amine

Product 1

HCID 116087122-tert-Butylamino-4-[4-fluoro-phenylethynyl]pyrimidineYield 84.4%

Reagents, catalysts & solvents 3

HCID 24350Copper(1+) iodide; Copper(I) iodide; Cuprous iodide; Cuprous iodide (CuI)CatalystHCID 8028TetrahydrofuranSolventHCID 8471TriethylamineSolvent

Procedure

To a mixture of Pd(PPh3)Cl2 (0.4 g) in Et3N (150 mL) and THF (150 mL) under a stream of N2, was added tert-butylamino-4-ethynylpyrimidine (18.6 g, 0.11 mol). After bubbling N2 into the solution for 15 min, 4-iodo-fluorobenzene (23.6 g, 0.11 mol) and CuI (0.22 g) were added sequentially. The mixture was stirred at rt for 2.5 h. The precipitate was filtered and washed with EtOAc. The filtrate was concentrated and the residue was diluted with EtOAc and loaded directly onto a short pad of silica gel. The product was eluted with 10% EtOAc in hexanes to afford the crude product, which was recrystallized from EtOAc/hexanes to give the title compound as a light yellow solid (25 g, 84%). TLC: Rf=0.30. mp 97-99° C. IR: 3287 (w), 2964 (w), 2222 (w), 1566 (s). 1H NMR: 8.26 (d, J=4.2 Hz, 1H), 7.60-7.55 (m, 2H), 7.10-7.00 (m, 2H), 6.65 (d, J=4.9 Hz, 1H), 5.22 (s, 1H), 1.45 (s, 9H). 13C NMR: 164.19, (162.19, 162.03), 157.77, 150.83, (134.35, 134.29), (117.84, 117.81), (115.94, 115.76), 112.37, 89.91, 87.24, 51.07, 28.86. Anal. Calcd for C16H16FN3: C, 71.36; H, 5.99; N, 15.60. Found: C, 71.25; H, 5.95; N, 15.66.

Workup

  1. customAfter bubbling N2 into the solution for 15 min
  2. filtrationThe precipitate was filtered
  3. washwashed with EtOAc
  4. concentrationThe filtrate was concentrated
  5. additionthe residue was diluted with EtOAc
  6. washThe product was eluted with 10% EtOAc in hexanes
  7. customto afford the crude product, which
  8. customwas recrystallized from EtOAc/hexanes

Sources & evidence

ORD record
ord-27df4694e23e4bdead5c73fa44c89047
Source dataset
uspto-grants-2012_08
Patent number
US08242273B2

Reaction notes

Loading…