Some common heterocyclic compound, 20780-72-7, name is 4-Bromoisatin, molecular formula is C8H4BrNO2, traditional synthetic route has been very mature, but the traditional synthetic route has various shortcomings, such as complicated route, low yield, poor purity, etc, below Introduce a new synthetic route. name: 4-Bromoisatin
To 4-bromoindoline-2,3-dione (8.94 g, 39.6 mmol) was added 1.0 M sodium hydroxide (40 mL, 120 mmol) to give a dark brown mixture. The mixture was heated to 80 °C then 20percent hydrogen peroxide (9 mL, 88 mmol) was added slowly over 15 min (caution: a strong exotherm was observed upon reagent addition). The mixture was then stirred at 80 °C for lh. After this time, the mixture was cooled in an ice bath to ~10 °C and then concentrated to a residue. HC1 was added cautiously to the residue until the pH of the mixture was 4-5. Once at the prescribed pH, the mixture was then concentrated to dryness and MeOH (150 ml) was added. The resulting suspension stirred for 15 min and then filtered. The filtrate wasconcentrated to dryness and dried under vacuum for 14 h to yield 2-amino-6- bromobenzoic acid (9.18 g) as a brown solid. 3/4 NMR (400 MHz, DMSO-d6) delta ppm 6.72 (1 H, t, J=7.91 Hz), 6.60 (1 H, dd, J=7.78, 1.00 Hz), 6.52 (1 H, dd, J=7.91, 1.13 Hz). LCMS Method D: retention time 0.68 min, [M+l] 200.0.
These compound has a wide range of applications. It is believed that with the continuous development of the source of the synthetic route 20780-72-7, its application will become more common.
Reference:
Patent; BRISTOL-MYERS SQUIBB COMPANY; JOHNSON, James A.; LLOYD, John; FINLAY, Heather; JIANG, Ji; NEELS, James; DHONDI, Naveen Kumar; GUNAGA, Prashantha; BANERJEE, Abhisek; ADISECHAN, Ashokkumar; WO2011/28741; (2011); A1;,
Indoline – Wikipedia,
Indoline | C8H9N – PubChem