Diethyl Ether → Diethyl (4-{[4-chloro-5-(trifluoromethyl) pyrimidin-2-yl]amino}-3-methoxybenzyl)phosphonate

HRID 1947809Notes

Reaction equation

HRID 1947809 reaction equation
CCOCC.Cl[C:7]1[N:12]=[C:11]([Cl:13])[C:10]([C:14]([F:17])([F:16])[F:15])=[CH:9][N:8]=1.[CH2:18]([O:20][P:21]([CH2:26][C:27]1[CH:32]=[CH:31][C:30]([NH2:33])=[C:29]([O:34][CH3:35])[CH:28]=1)(=[O:25])[O:22][CH2:23][CH3:24])[CH3:19].C(N(CC)CC)C>ClCCCl.CC(O)(C)C.[Cl-].[Cl-].[Zn+2]>[CH2:23]([O:22][P:21]([CH2:26][C:27]1[CH:32]=[CH:31][C:30]([NH:33][C:7]2[N:12]=[C:11]([Cl:13])[C:10]([C:14]([F:17])([F:16])[F:15])=[CH:9][N:8]=2)=[C:29]([O:34][CH3:35])[CH:28]=1)(=[O:25])[O:20][CH2:18][CH3:19])[CH3:24]

Participants

8

Reactant 4

HCID 3283Diethyl EtherHCID 8471TriethylamineHCID 27827742,4-Dichloro-5-(trifluoromethyl)pyrimidineHCID 86653997Diethyl(4-amino-3-methoxybenzyl)phosphonate

Product 1

HCID 86654002Diethyl (4-{[4-chloro-5-(trifluoromethyl) pyrimidin-2-yl]amino}-3-methoxybenzyl)phosphonateYield 70%

Reagents, catalysts & solvents 3

HCID 3007855ZincchlorideCatalystHCID 111,2-DichloroethaneSolventHCID 6386tert-ButanolSolvent

Procedure

1.0 M Zinc dichloride in ether (4.07 mL, 4.07 mmol) was added to a solution of the commercially available 2,4-dichloro-5-trifluoromethylpyrimidine (0.803 g, 3.70 mmol) in 1,2-dichloroethane (6.7 mL) and t-BuOH (6.7 mL). After 30 minutes diethyl(4-amino-3-methoxybenzyl)phosphonate (1.01 g, 3.70 mmol) was added followed by triethylamine (0.567 mL, 4.07 mmol) while keeping the temperature at ˜25° C. The reaction mixture was allowed to stir at rt overnight before quenching with sat. aq. NaHCO3 (10 mL). The resulting mixture was extracted with EtOAc (15 mL) and the organic layer was washed with brine (10 mL), dried over anhydrous NaSO4, filtered, and concentrated under reduced pressure to afford a yellow oil. This crude material was initially purified using an Isco Combiflash system eluting with 0→5% MeOH in DCM as eluent followed by preparative HPLC (MDP) to afford diethyl(4-{[4-chloro-5-(trifluoromethyl)pyrimidin-2-yl]amino}-3-methoxybenzyl)phosphonate, 1.09 g (70% yield). 1H NMR (CD3OD, 400 MHz): δ=1.28 (t, J=7.07 Hz, 6H), 3.23-3.29 (m, 2H), 3.90-3.95 (m, 3H), 4.01-4.13 (m, 4H), 6.90-6.96 (m, 1H), 7.03 (m, J=2.00 Hz, 1H), 8.02 (d, J=8.34 Hz, 1H), 8.62 (s, 1H).

Workup

  1. customat ˜25° C
  2. custombefore quenching with sat. aq. NaHCO3 (10 mL)
  3. extractionThe resulting mixture was extracted with EtOAc (15 mL)
  4. washthe organic layer was washed with brine (10 mL)
  5. dry with materialdried over anhydrous NaSO4
  6. filtrationfiltered
  7. concentrationconcentrated under reduced pressure
  8. customto afford a yellow oil
  9. customThis crude material was initially purified
  10. washeluting with 0→5% MeOH in DCM as eluent

Sources & evidence

ORD record
ord-85ce8f48de3b494b9039d96e4eee90cd
Source dataset
uspto-grants-2013_03
Patent number
US08399433B2

Reaction notes

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