反应详情

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)−.

1. stirringstirred at rt for 4 h
2. additionThe reaction mixture was diluted with ice cold water
3. extractionThe solution was extracted with EtOAc (5×100 mL)
4. dry with materialthe combined organic layer was dried over anhyd Na2SO4
5. filtrationfiltered
6. customThe solution was evaporated
7. customthe residue was chromatographed over silica gel column