Ethyl Acetate → t-Butyl N-[2-(t-Butyldiphenylsilyloxy)ethyl]-N-[3-[(4-chlorophenyl)sulfonyl]-3-(2,5-difluorophenyl)propyl]carbamate

HRID 748798Notes

Reaction equation

HRID 748798 reaction equation
[Cl:1][C:2]1[CH:7]=[CH:6][C:5]([S:8]([CH2:11][C:12]2[CH:17]=[C:16]([F:18])[CH:15]=[CH:14][C:13]=2[F:19])(=[O:10])=[O:9])=[CH:4][CH:3]=1.[Si:20]([O:37][CH2:38][CH2:39][N:40]([CH2:48][CH2:49]O)[C:41](=[O:47])[O:42][C:43]([CH3:46])([CH3:45])[CH3:44])([C:33]([CH3:36])([CH3:35])[CH3:34])([C:27]1[CH:32]=[CH:31][CH:30]=[CH:29][CH:28]=1)[C:21]1[CH:26]=[CH:25][CH:24]=[CH:23][CH:22]=1.C(C=P(CCCC)(CCCC)CCCC)#N.C(OCC)(=O)C>C1(C)C=CC=CC=1>[Si:20]([O:37][CH2:38][CH2:39][N:40]([CH2:48][CH2:49][CH:11]([S:8]([C:5]1[CH:6]=[CH:7][C:2]([Cl:1])=[CH:3][CH:4]=1)(=[O:10])=[O:9])[C:12]1[CH:17]=[C:16]([F:18])[CH:15]=[CH:14][C:13]=1[F:19])[C:41](=[O:47])[O:42][C:43]([CH3:46])([CH3:45])[CH3:44])([C:33]([CH3:34])([CH3:36])[CH3:35])([C:27]1[CH:32]=[CH:31][CH:30]=[CH:29][CH:28]=1)[C:21]1[CH:22]=[CH:23][CH:24]=[CH:25][CH:26]=1

Participants

6

Reactant 4

HCID 8857Ethyl AcetateHCID 4622928Cyanomethylenetributylphosphorane2×HCID 99010282-(((4-Chlorophenyl)sulfonyl)methyl)-1,4-difluorobenzeneHCID 59750865HCID 59750865, compound2×

Product 1

HCID 59028248t-Butyl N-[2-(t-Butyldiphenylsilyloxy)ethyl]-N-[3-[(4-chlorophenyl)sulfonyl]-3-(2,5-difluorophenyl)propyl]carbamateYield 95.2%

Reagents, catalysts & solvents 1

HCID 1140TolueneSolvent

Procedure

The 2-[(4-chlorophenyl)sulfonylmethyl]-1,4-difluorobenzene (500 mg, 1.65 mmol) obtained in Example 5 and t-butyl N-[2-(t-butyldiphenylsilyloxy)ethyl]-N-(2-hydroxyethyl)carbamate (950 mg, 2.14 mmol) were dissolved in toluene (20 ml), followed by the addition of cyanomethylenetri-n-butylphosphorane (600 mg, 2.49 mmol). Under an argon atmosphere, the resulting mixture was heated under reflux for 9 hours. After the reaction mixture was allowed to cool down, t-butyl N-[2-(t-butyldiphenylsilyloxy)ethyl]-N-(2-hydroxyethyl)carbamate (500 mg, 1.13 mmol) and cyanomethylenetri-n-butylphosphorane (300 mg, 1.24 mmol) were added thereto. Under an argon atmosphere, the resulting mixture was heated under reflux for 14 hours. After the reaction mixture was allowed to cool down, the residue obtained by concentrating the reaction mixture under reduced pressure was subjected to flash silica gel chromatography, and the fraction obtained from the hexane:ethyl acetate=15:1 eluate was concentrated under reduced pressure, whereby the title compound (1.14 g, 1.57 mmol, 95%) was obtained as a pale yellowish browh foam.

Workup

  1. temperatureUnder an argon atmosphere, the resulting mixture was heated
  2. temperatureunder reflux for 9 hours
  3. temperatureto cool down
  4. temperatureUnder an argon atmosphere, the resulting mixture was heated
  5. temperatureunder reflux for 14 hours
  6. temperatureto cool down
  7. customthe residue obtained
  8. concentrationby concentrating the reaction mixture under reduced pressure
  9. customthe fraction obtained from the hexane

Sources & evidence

ORD record
ord-ee9efde9dca24ce2941359bc61561c8e
Source dataset
uspto-grants-2008_07
Patent number
US07399775B2

Reaction notes

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