Ammonium Chloride → Benzyl {2-[3,5-bis(trifluoromethyl)phenyl]-2-hydroxy-1,1-dimethylethyl}carbamate

HRID 2093142Notes

Reaction equation

HRID 2093142 reaction equation
C([Mg]Br)C.I[C:6]1[CH:11]=[C:10]([C:12]([F:15])([F:14])[F:13])[CH:9]=[C:8]([C:16]([F:19])([F:18])[F:17])[CH:7]=1.[CH3:20][C:21]([NH:25][C:26](=[O:35])[O:27][CH2:28][C:29]1[CH:34]=[CH:33][CH:32]=[CH:31][CH:30]=1)([CH3:24])[CH:22]=[O:23].[NH4+].[Cl-]>C1COCC1.O>[F:17][C:16]([F:19])([F:18])[C:8]1[CH:7]=[C:6]([CH:22]([OH:23])[C:21]([NH:25][C:26](=[O:35])[O:27][CH2:28][C:29]2[CH:34]=[CH:33][CH:32]=[CH:31][CH:30]=2)([CH3:24])[CH3:20])[CH:11]=[C:10]([C:12]([F:15])([F:14])[F:13])[CH:9]=1

Participants

7

Reactant 4

HCID 25517Ammonium ChlorideHCID 6309701-Iodo-3,5-bis(trifluoromethyl)benzeneHCID 14578675(1,1-Dimethyl-2-oxoethyl)carbamic acid benzyl esterHCID 178418443HCID 178418443, compound

Product 1

HCID 53363830Benzyl {2-[3,5-bis(trifluoromethyl)phenyl]-2-hydroxy-1,1-dimethylethyl}carbamate

Reagents, catalysts & solvents 2

HCID 962WaterSolventHCID 8028TetrahydrofuranSolvent2×

Procedure

Ethylmagnesium bromide (1.63 mL, 1M in THF, 1.63 mmol) was added dropwise to a stirred solution of 1-iodo-3,5-bis(trifluoromethyl)benzene (608 mg, 317 μL, 1.79 mmol) in dry THF (1 mL) at room temperature under N2 and the reaction was stirred for 30 min. The resulting solution was added to a stirred solution of benzyl (1,1-dimethyl-2-oxoethyl)carbamate (163.5 mg, 0.739 mmol) in dry THF (1 mL) at −20° C. and reaction was allowed to warm to room temperature over 3 h. Saturated NH4Cl (10 mL) and water (10 mL) were added and the mixture was extracted with EtOAc (3×20 mL). The combined extracts were dried (Na2SO4) and concentrated in vacuo to give the crude product. This was purified by flash chromatography (Si, 25×160 mm, 0-40% EtOAc in hexanes gradient) to afford benzyl {2-[3,5-bis(trifluoromethyl)phenyl]-2-hydroxy-1,1-dimethylethyl}carbamate. Rf=0.40 (20% EtOAc in hexanes). LCMS calc.=436.1; found=436.0 (M+1)+. 1H NMR (600 MHz, CDCl3) δ 7.80 (s, 1H), 7.77 (s, 2H), 7.39-7.33 (m, 5H), 5.12-5.08 (m, 2H), 1.36 (s, 1H), 4.90 (d, J=4.4 Hz, 1H), 4.81 (s, 1H), 1.36 (s, 3H), 1.23 (s, 3H).

Workup

  1. customreaction
  2. extractionthe mixture was extracted with EtOAc (3×20 mL)
  3. dry with materialThe combined extracts were dried (Na2SO4)
  4. concentrationconcentrated in vacuo
  5. customto give the crude product
  6. customThis was purified by flash chromatography (Si, 25×160 mm, 0-40% EtOAc in hexanes gradient)

Sources & evidence

ORD record
ord-eebc0ac40b394225b0d74659ab67d135
Source dataset
uspto-grants-2013_05
Patent number
US08440702B2

Reaction notes

Loading…