Hydrochloric Acid → 2-(2,4-Dinitrobenzamido)acetic acid

Beteiligte Stoffe

Reaktionsschritte

To an ice cold suspension of glycine (1.01 g, 13.56 mmol) in water (20 mL) was added Na2CO3 (1.437 g, 13.56 mmol) and stirred for 10 min. A solution of 2,4-dinitrobenzoyl chloride (prepared from 2,4-dinitrobenzoic acid, 2.3 g with SOCl2, 20 mL) in dioxane (20 mL) was added to the above solution and stirred at rt for 4 h. The reaction mixture was diluted with ice cold water and acidified with cold dil. HCl (pH: 6.0). The solution was extracted with EtOAc (5×100 mL) and the combined organic layer was dried over anhyd Na2SO4 and filtered. The solution was evaporated and the residue was chromatographed over silica gel column using chloroform:methanol (95:5) as eluents to give the product as a white color solid (2.5 g, 85%), mp 188-190° C. 1H NMR (400 MHz, DMSO-d6): δ 12.79 (1H, br s), 9.29 (1H, t, J=5.4 Hz), 8.77 (1H, d, J=2.0 Hz), 8.64 (1H, dd, J=8.4, 2.0 Hz), 7.89 (1H, d, J=8.4 Hz), 3.99 (2H, d, J=6.0 Hz); LC-MS (negative ion mode): m/z 268 (M−H)−.

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