- Synthesis method of neostigmine bromide
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The invention relates to the technical field of medicine synthesis, in particular to a synthesis method of neostigmine bromide. The synthesis method comprises the following steps of 1) selecting m-aminophenol of a formula (1) to react with halogenated methane to obtain halogenated quaternary ammonium salt methyl ether of a formula (2), 2) adding a catalyst into the halogenated quaternary ammonium salt methyl ether in the formula (2), and removing methyl ether to obtain m-phenolic hydroxyl quaternary ammonium salt in a formula (3), 3) forming a compound shown in a formula (4) from the m-phenolic hydroxyl quaternary ammonium salt shown in the formula (3) under a strong alkali condition, and 4) carrying out esterification reaction on the compound in the formula (4) and dimethyl carbamoyl bromide to obtain neostigmine bromide in a formula (5). According to the method, the m-aminophenol is adopted as the starting material, the price of the m-aminophenol is only one hundred of that of m-dimethylaminophenol, the cost of the neostigmine bromide can be greatly reduced when the m-aminophenol is used for synthesizing the neostigmine bromide, and mass production can be achieved.
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Paragraph 0029; 0043; 0049; 0057; 0063
(2021/08/21)
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- Opthalmic solution
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An ophthalmic solution is provided for treatment of "dry eye", providing lubricating and cushioning effects for traumatized eyes, including trauma caused by the wearing of hard or gel-type contact lenses, and as a carrier for ophthalmic medicaments. The solution is an aqueous solution of polyethylene oxide, optionally polyethylene glycol, and other optional ingredients.
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- Polystyrene sulfonate containing opthalmic solutions
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An opthalmic solution is provided for treatment of "dry eye", providing lubricating and cushioning effects for traumatized eyes, including trauma caused by the wearing of hard or gel-type contact lenses, and as a carrier for opthalmic medicaments. The solution is an aqueous solution of polystyrene sulfonate, optionally and preferably including polyethylene glycol, and other optional ingredients.
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