p-Toluenesulfonic acid → HCID 15107107, compound

HRID 2255752Notes

Reaction equation

HRID 2255752 reaction equation
[CH2:1]([O:8][C:9]([NH:11][C@@H:12]([CH2:17][CH:18]1[CH2:23][CH2:22][CH2:21][CH2:20][CH2:19]1)[CH:13]([OH:16])[CH:14]=[CH2:15])=[O:10])[C:2]1[CH:7]=[CH:6][CH:5]=[CH:4][CH:3]=1.CO[C:26](OC)([CH3:28])[CH3:27].C1(C)C=CC(S(O)(=O)=O)=CC=1.C(OCC)(=O)C>ClCCl>[CH2:1]([O:8][C:9]([N:11]1[C@@H:12]([CH2:17][CH:18]2[CH2:19][CH2:20][CH2:21][CH2:22][CH2:23]2)[CH:13]([CH:14]=[CH2:15])[O:16][C:26]1([CH3:28])[CH3:27])=[O:10])[C:2]1[CH:7]=[CH:6][CH:5]=[CH:4][CH:3]=1

Participants

6

Reactant 4

HCID 6101p-Toluenesulfonic acidHCID 64952,2-DimethoxypropaneHCID 8857Ethyl AcetateHCID 15107105HCID 15107105, compound

Product 1

HCID 15107107HCID 15107107, compound

Reagents, catalysts & solvents 1

HCID 6344DichloromethaneSolvent

Procedure

983 mg of (3RS,4S)-4-(benzyloxycarbonyl)amino-5-cyclohexylpentene-3-ol was dissolved in 5 ml of dichloromethane, and 4 ml of 2,2-dimethoxypropane and 30 mg of dry p-toluenesulfonic acid were added thereto. The mixture was stirred at room temperature overnight. Then, 100 ml of ethyl acetate was added to the reaction mixture. The mixture was washed with a saturated sodium hydrogencarbonate aqueous solution and with a saturated sodium chloride aqueous solution. Then, the organic layer was dried over anhydrous magnesium sulfate. The solvent was distilled off under reduced pressure, and the residue was purified by silica gel column chromatography (n-hexane/ethyl acetate=20/1) to obtain 967 mg of (4S,5RS)-3-benzyloxycarbonyl-4-cyclohexylmethyl-5-ethenyl-2,2-dimethyloxazolidine as colorless oily substance.

Workup

  1. washThe mixture was washed with a saturated sodium hydrogencarbonate aqueous solution and with a saturated sodium chloride aqueous solution
  2. dry with materialThen, the organic layer was dried over anhydrous magnesium sulfate
  3. distillationThe solvent was distilled off under reduced pressure
  4. customthe residue was purified by silica gel column chromatography (n-hexane/ethyl acetate=20/1)

Sources & evidence

ORD record
ord-b3f21698205644f88a2e31b2509cf9e0
Source dataset
uspto-grants-1993_08
Patent number
US05240924

Reaction notes

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