Potassium chromate(VI) → HCID 59557758, compound

HRID 2174330Notes

Reaction equation

HRID 2174330 reaction equation
[C:1]([O:4][C@H:5]1[C@H:10]([O:11][C:12](=[O:14])[CH3:13])[C@@H:9]([O:15][C:16](=[O:18])[CH3:17])[C@H:8]([C:19]2[CH:24]=[CH:23][C:22]([Cl:25])=[C:21]([CH2:26][C:27]3[CH:32]=[CH:31][C:30]([CH2:33][CH3:34])=[CH:29][CH:28]=3)[CH:20]=2)[O:7][C@@H:6]1[CH2:35][O:36][C:37](=[O:39])[CH3:38])(=[O:3])[CH3:2].[Cr]([O-])([O-])(=O)=[O:41].[K+].[K+]>C(O)(=O)C>[C:1]([O:4][C@H:5]1[C@H:10]([O:11][C:12](=[O:14])[CH3:13])[C@@H:9]([O:15][C:16](=[O:18])[CH3:17])[C@H:8]([C:19]2[CH:24]=[CH:23][C:22]([Cl:25])=[C:21]([CH2:26][C:27]3[CH:28]=[CH:29][C:30]([C:33](=[O:41])[CH3:34])=[CH:31][CH:32]=3)[CH:20]=2)[O:7][C@@H:6]1[CH2:35][O:36][C:37](=[O:39])[CH3:38])(=[O:3])[CH3:2]

Participants

4

Reactant 2

HCID 24597Potassium chromate(VI)HCID 11671302HCID 11671302, compound

Product 1

HCID 59557758HCID 59557758, compoundYield 37%

Reagents, catalysts & solvents 1

HCID 176Acetic AcidSolvent

Conditions

Temperature
120 °C

Procedure

To a stirred solution of (2R,3R,4R,5S,6S)-2-(acetoxymethyl)-6-(4-chloro-3-(4-ethylbenzyl)phenyl)tetrahydro-2H-pyran-3,4,5-triyl triacetate (10 g, 10.8 mmol) (prepared using methods analogous to those described in US20040138439) in acetic acid (130 mL) at 120° C. was added potassium chromate (6.3 g, 21.4 mmol) in one portion. The mixture was stirred for 22 hours at 120° C. The solvents were removed under reduced pressure, ethyl acetate was added, and the solid was filtered. The organic layer was washed with saturated aqueous sodium bicarbonate and then with brine, and then dried over sodium sulfate. The sample was concentrated, and the resulting residue was purified by silica gel chromatography (3:1 petroleum ether:ethyl acetate) to give pure product 47 as a solid (2.3 g). 1H-NMR (CDCl3, 400 MHz): δ 7.90 (d, J=8.0 Hz, 2H), 7.39 (d, J=8.4 Hz, 1H), 7.26 (d, J=8.4 Hz, 2H), 7.22 (dd, J=8.4, 2.2 Hz, 1H), 7.17 (d, J=2.0 Hz, 1H), 5.31 (t, J=9.4 Hz, 1H), 5.22 (t, J=9.8 Hz, 1H), 5.09 (t, J=9.4 Hz, 1H), 4.35 (d, J=10.0 Hz, 1H), 4.29 (dd, J=12.4, 4.8 Hz, 1H), 4.18-4.13 (m, 3H), 3.85-3.81 (m, 1H), 2.60 (s, 3H), 2.09 (s, 3H), 2.07 (s, 3H), 2.01 (s, 3H), 1.75 (s, 3H); MS ESI: 575 [M+H]+, 619 [M+HCO2]−.

Workup

  1. customat 120° C.
  2. customThe solvents were removed under reduced pressure, ethyl acetate
  3. additionwas added
  4. filtrationthe solid was filtered
  5. washThe organic layer was washed with saturated aqueous sodium bicarbonate
  6. dry with materialwith brine, and then dried over sodium sulfate
  7. concentrationThe sample was concentrated
  8. customthe resulting residue was purified by silica gel chromatography (3:1 petroleum ether:ethyl acetate)

Sources & evidence

ORD record
ord-3c5a36b7525c4bcd8f90fec23929b501
Source dataset
uspto-grants-2015_06
Patent number
US09061060B2

Reaction notes

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