Sodium Chloride → 7-Hydroxy-2,3-dimethyl-2,3-dihydro-isoindol-1-one

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Reaction Conditions

Reaction Steps

7-amino-2,3-dimethyl-2,3-dihydro-isoindol-1-one (11.45 g) is suspended in a mixture of ice (27 g) and H2SO4 conc. (9.70 mL) and cooled to −10° C. Aqueous sodium nitrite solution (2.5 molar, 31.18 mL) is added dropwise, so that the temperature does not rise above 0° C. and the solution is stirred for 15 min at this temperature. Then H20 (135 mL) is added and the solution is heated to 80° C. for 15 min. For working up it is combined with 10% NaCl solution (100 mL) and extracted twice with 100 mL of CH2Cl2. The organic phase is extracted with NaOH solution (0.2 molar) and then the aqueous phase is acidified (HCl aq. conc.) and re-extracted with CH2Cl2. The organic phase is dried on magnesium sulphate, filtered off from the desiccant and the solvent is eliminated in vacuo.

Provenance & Evidence