Sulfuric acid magnesium salt (1:1) → 1,5-anhydro-2,4-dideoxy-2-(6-(4-methoxybenzyl)-4,5-dimethyl-1-oxo-1,3-dihydro-2H-isoindol-2-yl)-L-threo-pentitol

HRID 629423Notes

Reaction equation

HRID 629423 reaction equation
[CH:1]([C:3]1[C:12]([CH3:13])=[C:11]([CH3:14])[C:10]([CH2:15][C:16]2[CH:21]=[CH:20][C:19]([O:22][CH3:23])=[CH:18][CH:17]=2)=[CH:9][C:4]=1[C:5](OC)=[O:6])=O.[NH2:24][C@@H:25]1[C@@H:30]([OH:31])[CH2:29][CH2:28][O:27][CH2:26]1.S([O-])([O-])(=O)=O.[Mg+2]>C1COCC1>[CH3:23][O:22][C:19]1[CH:18]=[CH:17][C:16]([CH2:15][C:10]2[CH:9]=[C:4]3[C:3]([CH2:1][N:24]([C@@H:25]4[C@@H:30]([OH:31])[CH2:29][CH2:28][O:27][CH2:26]4)[C:5]3=[O:6])=[C:12]([CH3:13])[C:11]=2[CH3:14])=[CH:21][CH:20]=1

Participants

5

Reactant 3

HCID 24083Sulfuric acid magnesium salt (1:1)HCID 55285677(3S,4S)-3-Aminotetrahydro-2H-pyran-4-OLHCID 118468425Methyl 2-formyl-5-(4-methoxybenzyl)-3,4-dimethylbenzoate

Product 1

HCID 1184681511,5-anhydro-2,4-dideoxy-2-(6-(4-methoxybenzyl)-4,5-dimethyl-1-oxo-1,3-dihydro-2H-isoindol-2-yl)-L-threo-pentitolYield 32.8%

Reagents, catalysts & solvents 1

HCID 8028TetrahydrofuranSolvent

Procedure

To a solution of methyl 2-formyl-5-(4-methoxybenzyl)-3,4-dimethylbenzoate (0.10 g) in THF (1.90 mL) were added (3S,4S)-3-aminotetrahydro-2H-pyran-4-ol (0.04 g) and anhydrous magnesium sulfate (0.07 g), and the mixture was stirred at room temperature for 5 hr. The insoluble substance was removed by filtration, and the filtrate was concentrated. The residue was diluted with methanol (1.90 mL)-THF (1.90 mL), sodium triacetoxyborohydride (0.13 g) was added thereto, and the mixture was stirred at room temperature for 2.5 days. The reaction mixture was diluted with ethyl acetate, and the mixture was washed with water and saturated brine. The organic layer was concentrated under reduced pressure, and the residue was purified by silica gel column chromatography (ethyl acetate/hexane) to give the title compound (0.04 g).

Workup

  1. customThe insoluble substance was removed by filtration
  2. concentrationthe filtrate was concentrated
  3. additionThe residue was diluted with methanol (1.90 mL)-THF (1.90 mL), sodium triacetoxyborohydride (0.13 g)
  4. additionwas added
  5. stirringthe mixture was stirred at room temperature for 2.5 days
  6. additionThe reaction mixture was diluted with ethyl acetate
  7. washthe mixture was washed with water and saturated brine
  8. concentrationThe organic layer was concentrated under reduced pressure
  9. customthe residue was purified by silica gel column chromatography (ethyl acetate/hexane)

Sources & evidence

ORD record
ord-f9a1b7dc14d4476fa5f6a66b9371f166
Source dataset
uspto-grants-2016_04
Patent number
US09315458B2

Reaction notes

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