Benzenesulfinic acid → HCID 22959677, compound

HRID 2304117Notes

Reaction equation

HRID 2304117 reaction equation
[C:1]1([S:7]([OH:9])=[O:8])[CH:6]=[CH:5][CH:4]=[CH:3][CH:2]=1.[Cl-].[Ca+2].[Cl-].[F:13][C:14]1[CH:28]=[CH:27][C:17]([O:18][CH2:19][C@H:20]2[O:25][CH:24](O)[CH2:23][CH2:22][CH2:21]2)=[CH:16][CH:15]=1>C(Cl)Cl>[C:1]1([S:7]([CH:24]2[CH2:23][CH2:22][CH2:21][C@@H:20]([CH2:19][O:18][C:17]3[CH:16]=[CH:15][C:14]([F:13])=[CH:28][CH:27]=3)[O:25]2)(=[O:9])=[O:8])[CH:6]=[CH:5][CH:4]=[CH:3][CH:2]=1

Participants

5

Reactant 3

HCID 12057Benzenesulfinic acidHCID 5284359Calcium ChlorideHCID 20588440HCID 20588440, compound

Product 1

HCID 22959677HCID 22959677, compoundYield 76.7%

Reagents, catalysts & solvents 1

HCID 6344DichloromethaneSolvent2×

Procedure

25% HCl was added dropwise to benzenesulfinic acid sodium salt (0.6 g), until the solid dissolved. This mixture was extracted with ethyl acetate (5 ml) dried (Na2SO4) and concentrated to give benzenesulfinic acid (0.4 g). To an ice-cooled mixture of benzenesulfinic acid (0.32 g, 2.23 mmol) and calcium chloride (0.25 g, 2.23 mmol) in dry CH2Cl2 a solution of (2RS, 6S)-6-(4-fluorophenoxymethyl)-2-hydroxy-tetrahydropyran (0.42 g, 1.86 mmol) in dry CH2Cl2 (5 ml) was added. The reaction mixture was stirred for 4 h, filtered through celite and washed with CH2Cl2. The combined organic layers were washed with saturated aqueous Na2CO3, water, brine and dried (Na2SO4). The solvent was removed under vacuum and the residue was purified on a silica gel column using light petroleum-ethyl acetate (4:1) as eluent to afford pure (2RS, 6S)-2-benzenesulfonyl-6-(4-fluorophenoxymethyl)-tetrahydropyran (0.5 g, 70%) as a viscous liquid. TLC:ethyl acetate-light petroleum (1:3), Rf=0.4. 1H NMR (CDCl3, 200 MHz): δ 1.5 (m, 2H), 1.75-2.0 (m, 2H), 2.2-2.4 (m, 1H), 2.6-2.8 (m, 1H), 3.75-3.9 (m, 2H), 4.65 (d, 1H), 4.85-5.0 (m, 1H), 6.7-7.0 (m, 4H), 7.5-7.7 (m, 3H), 7.95 (d, J=5.4 Hz, 2H).

Workup

  1. additionwas added
  2. filtrationfiltered through celite
  3. washwashed with CH2Cl2
  4. washThe combined organic layers were washed with saturated aqueous Na2CO3, water, brine
  5. dry with materialdried (Na2SO4)
  6. customThe solvent was removed under vacuum
  7. customthe residue was purified on a silica gel column

Sources & evidence

ORD record
ord-918bf68e4cb540e094214d5f76b7cd04
Source dataset
uspto-grants-2002_08
Patent number
US06433197B1

Reaction notes

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