Ethyl chloroformate → HCID 10179718, compound

HRID 2101724Notes

Reaction equation

HRID 2101724 reaction equation
[Cl:1][C:2]1[CH:7]=[C:6]([Cl:8])[CH:5]=[CH:4][C:3]=1[C:9]1[N:10]=[CH:11][N:12]([CH3:21])[C:13]=1[C:14]1[CH:19]=[CH:18][C:17]([Cl:20])=[CH:16][CH:15]=1.C([Li])CCC.Cl[C:28]([O:30][CH2:31][CH3:32])=[O:29]>C1COCC1>[Cl:1][C:2]1[CH:7]=[C:6]([Cl:8])[CH:5]=[CH:4][C:3]=1[C:9]1[N:10]=[C:11]([C:28]([O:30][CH2:31][CH3:32])=[O:29])[N:12]([CH3:21])[C:13]=1[C:14]1[CH:19]=[CH:18][C:17]([Cl:20])=[CH:16][CH:15]=1

Participants

5

Reactant 3

HCID 10928Ethyl chloroformateHCID 22066095HCID 22066095, compoundHCID 178418339Butyllithium

Product 1

HCID 10179718HCID 10179718, compound

Reagents, catalysts & solvents 1

HCID 8028TetrahydrofuranSolvent

Procedure

To a solution of 4-(2,4-dichlorophenyl)-5-(4-chlorophenyl)-1-methylimidazole (72 mg, 0.21 mmol) from Example 32, Step C (lower Rf isomer) in THF (3 mL) cooled to −70° C. in a dry ice/acetone bath was added 1.6N n-butyl lithium in hexanes (0.160 mL, 0.26 mmol). The reaction was stirred for 1 hr and then ethyl chloroformate (0.045 mL, 42 mmol) was added via syringe. The reaction was allowed to warm to rt for 1 hr and was then quenched with aq. sodium bicarbonate and extracted twice with ethyl acetate. The organic layers were washed with brine, dried over sodium sulfate, and evaporated. The residue was purified by Prep TLC (2×1 mm, silica) (25% ethyl acetate in hexanes) to afford the title compound.

Workup

  1. customwas then quenched with aq. sodium bicarbonate
  2. extractionextracted twice with ethyl acetate
  3. washThe organic layers were washed with brine
  4. dry with materialdried over sodium sulfate
  5. customevaporated
  6. customThe residue was purified by Prep TLC (2×1 mm, silica) (25% ethyl acetate in hexanes)

Sources & evidence

ORD record
ord-21ed47fb72d54668a380d20856d0b4e4
Source dataset
uspto-grants-2009_08
Patent number
US07572785B2

Reaction notes

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