Acetic Acid → HCID 89690464, 화합물

온도

75 °C

In a 500 ml round bottom flask equipped with a magnetic stir bar, the iron powder (5.59 g, 100.15 mmol) was suspended in clean, dry, reagent-grade ethanol (300.00 ml, 5138.06 mmol) and the mixture was stirred vigorously under nitrogen at room temperature. To this was added the acetic acid (30.00 ml, 524.05 mmol) and the reaction was allowed to stir for 5 min before the 2-chloro-5-nitro-4-(4-o-tolyl-piperazin-1-yl)-benzoic acid 1d (1.51 g, 4.01 mmol) was added in one portion. The reaction was then warmed to 75° C. and allowed to stir overnight. The reaction was cooled to room temperature and was then filtered through Celite, washing heavily with methanol. The deep red product solution was then concentrated under reduced pressure and the resultant ruby red oil was taken up in 200 ml of ethyl acetate. To this solution was added 200 ml of saturated NaHCO3 (aq) solution and the layers were then separated and the product was extracted out of the aqueous using ethyl acetate (3×100 ml). The organic phases were then combined and washed with brine (1×200 ml) and dried over Na2SO4. The solution was then decanted and the solvent was removed under reduced pressure. The crude product, 5-amino-2-chloro-4-(4-o-tolyl-piperazin-1-yl)-benzoic acid 14a (1.22 g, 3.53 mmol), was isolated as a brown solid and was carried on without further purification. LCMS=346 (M+H).