4-Aminosalicylic Acid → 2-Hydroxy-4-(3-nitro-benzylamino)-benzoic acid

Beteiligte Stoffe

Reaktionsschritte

To a solution of 4-amino salicylic acid (153 mg; 1 mmol) in 1,2-dichloroethane (4 mL) under argon atmosphere was added sodium triacetoxyborohydride (317 mg; 1.5 mmol) and 3-nitrobenzaldehyde (226 mg; 1.5 mmol). The mixture was stirred at room temperature under argon overnight after which time 1 M NaOH (sq.; 5 mL) was added and the two layers separated. The aqueous layer was acidified with 2 M HCl (aq) and the precipitate formed filtered off and dried to yield 160 mg (55%) of a yellowish powder with satisfactorily purity. Mp. 189° C. (decomposes); MS (ESI−): 287 (MH−).

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