Drug benzophenoxazines compound for treating cataract and preparation method thereof
A technology of benzophenoxazines and compounds, applied in the application field of pharmaceutical compositions in cataract diseases, can solve problems such as the reversal of cataract processes, and achieve the effects of strong affinity, increased reaction yield, and high yield
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Embodiment 1
[0058] Preparation of 1-methoxy-5-oxo-9-amino-5H-pyrido-[3,2-a]-phenoxazine-3-carboxylic acid.
[0059]
[0060] The synthesis steps are:
[0061] In the first step, pure water (50ml), 4-methoxy-2-methylpyridine compound (1) (10g) and succinic anhydride (8g) are added to a three-necked flask equipped with a stirrer, thermometer and condenser. ), after the water bath is heated to 80°C, add potassium permanganate (total 6g) in three batches, keep the temperature at 84°C, the potassium permanganate to be added has reacted completely, and the solution in the reaction flask is dark brown without purple , Then add the next batch of potassium permanganate, and proceed in this way. After all the potassium permanganate has been reacted, keep stirring at 82°C for at least 45 minutes, filter while hot to remove manganese dioxide, and wash twice with hot distilled water. Manganese oxide until the filtrate is a colorless and transparent solution to obtain a solution containing potassium 1-meth...
Embodiment 2
[0068] Preparation of 1-methoxy-5-oxo-9-chloro-5H-pyrido-[3,2-a]-phenoxazine-3-carboxylic acid.
[0069]
[0070] The synthesis steps are:
[0071] In the first step, pure water (50ml), 4-methoxy-2-methylpyridine compound (1) (15g) and succinic anhydride (8.9) are added to a three-necked flask equipped with a stirrer, thermometer and condenser. g) After the water bath is heated to 80°C, add potassium permanganate (8g in total) in three batches, keep the temperature at 80°C, the potassium permanganate to be added has reacted completely, and the solution in the reaction flask is dark brown without purple When the time, add the next batch of potassium permanganate, and proceed in this way. After all the potassium permanganate has reacted, keep stirring at 82°C for at least 45 minutes, filter while hot to remove manganese dioxide, and wash with hot distilled water several times Manganese dioxide, until the filtrate is a colorless and transparent solution, a solution containing potassi...
Embodiment 3
[0078] The compound of Example 3 1-methoxy-5-oxo-9-carboxy-5H-pyrido-[3,2-a]-phenoxazine-3-carboxylic acid.
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