Tetrahydrofuran → (S)-ethyl 2-tert-butoxy-2-(6-formyl-3-methyl-1-(trifluoromethyl-sulfonyloxy)naphthalen-2-yl)acetate

HRID 926180Notes

Reaction equation

HRID 926180 reaction equation
[C:1]([O:5][C@@H:6]([C:12]1[C:21]([CH3:22])=[CH:20][C:19]2[C:14](=[CH:15][CH:16]=[C:17]([CH:23]=C)[CH:18]=2)[C:13]=1[O:25][S:26]([C:29]([F:32])([F:31])[F:30])(=[O:28])=[O:27])[C:7]([O:9][CH2:10][CH3:11])=[O:8])([CH3:4])([CH3:3])[CH3:2].C1C[O:36]CC1>O>[C:1]([O:5][C@@H:6]([C:12]1[C:21]([CH3:22])=[CH:20][C:19]2[C:14](=[CH:15][CH:16]=[C:17]([CH:23]=[O:36])[CH:18]=2)[C:13]=1[O:25][S:26]([C:29]([F:32])([F:30])[F:31])(=[O:27])=[O:28])[C:7]([O:9][CH2:10][CH3:11])=[O:8])([CH3:2])([CH3:3])[CH3:4]

Participants

4

Reactant 2

HCID 8028TetrahydrofuranHCID 89733247(S)-ethyl 2-tert-butoxy-2-(3-methyl-1-(trifluoromethylsulfonyloxy)-6-vinylnaphthalen-2-yl)acetate

Product 1

HCID 88583821(S)-ethyl 2-tert-butoxy-2-(6-formyl-3-methyl-1-(trifluoromethyl-sulfonyloxy)naphthalen-2-yl)acetate

Reagents, catalysts & solvents 1

HCID 962WaterSolvent

Procedure

A solution of (S)-ethyl 2-tert-butoxy-2-(3-methyl-1-(trifluoromethylsulfonyloxy)-6-vinylnaphthalen-2-yl)acetate (0.60 g, 1.3 mmol) in THF (7 mL) at room temperaturewas treated with a previously prepared mixture of K2OsO4.2H2O (0.023 g, 0.063 mmol) and NaIO4 (0.81 g, 3.8 mmol) in water (5 mL). The resulting suspension becomes thick and opaque. After vigorous stirring for 20 min, the suspension is filtered through a pad of Celite, and the filtrate is washed with batches of EtOAc until white in color. The collected mother liquor is further diluted with water and EtOAc. Following separation, the aqueous layer is extracted with EtOAc until colorless. The combined organics are washed with brine, dried over anhydrous MgSO4, filtered and concentrated in vacuo. The residue is purified by Yamazen column chromatography (15-35% EtOAc/hex) to afford the desired material. 1H-NMR: 400 MHz, (CDCl3) δ: 10.19 (s, 1H); 8.31 (br s, 1H); 8.16 (d, J=8.8 Hz, 1H); 8.05 (dd, J=8.8, 1.6 Hz, 1H); 7.85 (s, 1H); 5.76 (s, 1H); 4.28-4.10 (m, 2H); 2.61 (s, 3H); 1.22 (s, 9H); 1.18 (t, J=7.2 Hz, 3H).

Workup

  1. filtrationthe suspension is filtered through a pad of Celite
  2. washthe filtrate is washed with batches of EtOAc until white in color
  3. additionThe collected mother liquor is further diluted with water and EtOAc
  4. customseparation
  5. extractionthe aqueous layer is extracted with EtOAc until colorless
  6. washThe combined organics are washed with brine
  7. dry with materialdried over anhydrous MgSO4
  8. filtrationfiltered
  9. concentrationconcentrated in vacuo
  10. customThe residue is purified by Yamazen column chromatography (15-35% EtOAc/hex)

Sources & evidence

ORD record
ord-5fa6417698944799af558c716835d425
Source dataset
uspto-grants-2016_03
Patent number
US09284323B2

Reaction notes

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