4-Hydroxybenzaldehyde → HCID 58097238, compound

HRID 2092230Notes

Reaction equation

[OH:1][C:2]1[CH:9]=[CH:8][C:5]([CH:6]=[O:7])=[CH:4][CH:3]=1.C(=O)([O-])[O-].[K+].[K+].[CH2-:16][C:17]([CH3:19])=[O:18].Cl[CH2:21][C@@H:22]([OH:25])[CH2:23]O.O>CN(C=O)C>[CH3:16][C:17]1([CH3:19])[O:25][C@H:22]([CH2:23][O:1][C:2]2[CH:9]=[CH:8][C:5]([CH:6]=[O:7])=[CH:4][CH:3]=2)[CH2:21][O:18]1

Participants

Conditions

Temperature: 160 °C

Procedure

31.2 g (255.4 mmol) of 4-hydroxybenzaldehyde are initially charged in 400 ml of dry DMF, and 105.7 g (766.1 mmol) of potassium carbonate and 50.0 g (332.0 mmol) of (S)-(−)-3-chloro-1,2-propanediol acetonide are added at RT. The mixture is stirred at 160° C. for 16 h. 4000 ml of water are then added, and the mixture is extracted three times with in each case 500 ml of ethyl acetate. The combined organic phases are washed in each case once with 500 ml water and 500 ml of sat. aqueous sodium chloride solution. After drying over magnesium sulfate, the solvent is removed on a rotary evaporator and the residue is purified by column chromatography on silica gel 60 (mobile phase gradient: ethyl acetate/petroleum ether 1:9→2:8).

Workup

extractionthe mixture is extracted three times with in each case 500 ml of ethyl acetate
washThe combined organic phases are washed in each case once with 500 ml water and 500 ml of sat. aqueous sodium chloride solution
dry with materialAfter drying over magnesium sulfate
customthe solvent is removed on a rotary evaporator
customthe residue is purified by column chromatography on silica gel 60 (mobile phase gradient: ethyl acetate/petroleum ether 1:9→2:8)

Sources & evidence

ORD record: ord-56b1055043594a15b4791c7dd93df15e
Source dataset: uspto-grants-2013_05
DOI: 10.6084/m9.figshare.5104873.v1
Patent number: US08440700B2

Reaction notes

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