p-Toluenesulfonic acid → HCID 59971325, compound

HRID 413566Notes

Reaction equation

HRID 413566 reaction equation
[F:1][C:2]1[CH:18]=[CH:17][C:5]([O:6][CH2:7][C@@H:8](O)[CH2:9][CH2:10][CH2:11][C:12]([O:14]C)=[O:13])=[CH:4][CH:3]=1.CC1C=CC(S(O)(=O)=O)=CC=1.C(=O)(O)[O-].[Na+]>C(Cl)Cl>[F:1][C:2]1[CH:3]=[CH:4][C:5]([O:6][CH2:7][C@H:8]2[O:14][C:12](=[O:13])[CH2:11][CH2:10][CH2:9]2)=[CH:17][CH:18]=1

Participants

5

Reactant 3

HCID 6101p-Toluenesulfonic acidHCID 516892Sodium BicarbonateHCID 59904767HCID 59904767, compound

Product 1

HCID 59971325HCID 59971325, compoundYield 71.5%

Reagents, catalysts & solvents 1

HCID 6344DichloromethaneSolvent

Conditions

Temperature
40 °C

Procedure

To a solution of methyl (S)-6-(4-fluorophenoxy)-5-hydroxy-hexanoate (0.8 g 3.12 mmol) in CH2Cl2 (20 ml), a catalytic amount of PTSA (10 mg) was added and the reaction mixture was stirred at 40° C. for 12 h. The reaction was then neutralised with sodium bicarbonate and the product extracted with dichloromethane. The organic layer was dried (Na2SO4) and concentrated. The crude product on purification on a silica gel (EtOAc-light petroleum (1:3) as eluent) gave (6S)-6-(4-fluorophenoxymethyl)-tetrahydropyran-2-one (0.5 g, 70%) as a colourless liquid. TLC:ethyl acetate-light petroleum (1:4), Rf=0.3. Optical rotation [α]D: +19° (c 0.9, CHCl3). 1H NMR (CDCl3, 200 MHz): δ 1.7-2.15 (m, 4H), 2.48-2.7 (m, 2H), 3.95-4.15 (m, 2H), 4.55-4.7 (m, 1H), 6.77-7.0 (m, 4H).

Workup

  1. extractionthe product extracted with dichloromethane
  2. dry with materialThe organic layer was dried (Na2SO4)
  3. concentrationconcentrated
  4. customThe crude product on purification on a silica gel (EtOAc-light petroleum (1:3) as eluent)

Sources & evidence

ORD record
ord-45b53fb945b343df8e88d9ec2634dcea
Source dataset
uspto-grants-2003_05
Patent number
US06566538B1

Reaction notes

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