Reference of 18711-15-4,Some common heterocyclic compound, 18711-15-4, name is 4,6-Dichloroisatin, molecular formula is C8H3Cl2NO2, 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.
Step 3 Preparation of 2-amino-4,6-dichlorobenzoic acid To a solution of 4,6-dihloro-1H-indole-2,3-dione (5.0 g, 23.1 mmol) in 75 ml of 1 N NaOH was partially added hydrogen peroxide (28% v/v, 10 ml) at room temperature. After stirring the mixture for 2 hours, an insoluble dark brown solid was removed by filtration. The filtrate was acidified with a cone, hydrochloric acid to a pH of 2. The yellow precipitate thus formed was harvested, washed with distilled water, and dried in a vacuum. Recrystallization in benzene produced the title compound as an ivory solid (3.90 g, 82%). TLC Rf=0.1 (ethylacetate: n-hexane=1:1); m.p. 188-189 C.; 1H NMR (DMSO-d6) delta 6.76 (d, 1H, J=1.9 Hz, ArH), 6.85 (d, 1H, J=1.9 Hz, ArH); MS (EI) m/e 206 [M+], 162 [M+-CO2].
These compound has a wide range of applications. It is believed that with the continuous development of the source of the synthetic route 4,6-Dichloroisatin, its application will become more common.
Reference:
Patent; Korea Research Institute of Chemical Technology; US2009/203708; (2009); A1;,
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