4-Hydroxy-3-nitrobenzoic acid → 2-Nitrophenol

Participants

Reaction Steps

In a 50 mL polystyrene cartridge, to an amino polystyrene resin (1 g, 1.2 mmol) in DMF (15 mL) were added 4-hydroxy-3-nitrobenzoic acid (1a) (1 g, 5.46 mmol), HOBt (1 g, 7.4 mmol), and DIC (1,3-diisopropylcarbodiimide, 1 mL, 6.4 mmol). After overnight shaking, the reaction mixture was washed with DMF (20 mL, 5 times), methylene chloride, and methanol (20 mL, 5 times each). To remove any undesirable side product, DMF (5 mL) and piperidine (0.5 mL) were added to the cartridge and allowed to shake for 1.5 h. The resin was filtered and washed with DMF. The resulting piperidine salt was removed via the addition of a 10% HCl solution (in DMF, 20 mL) to the resin that was allowed to shake for 1.5 h. The mixture was then filtered, washed with DMF (20 mL, 5 times), methanol, and methylene chloride (20 mL, 5 times each) and dried by nitrogen gas flow.

Provenance & Evidence