165049-28-5Relevant articles and documents
Method for preparing pemetrexed disodium at high yield
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Page/Page column 9-13, (2021/01/12)
The invention relates to a preparation method of pemetrexed disodium. The preparation method is characterized in that an alkali-modified microporous/mesoporous molecular sieve catalyst is used as a catalyst to replace NaOH as a reaction catalyst, so favorable yield and product purity are obtained under the condition of enlarged reaction scale.
Pemetrexed disodium intermediate and preparation method thereof
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Paragraph 0104-0107, (2019/10/17)
The invention belongs to the technical field of medicines, and particularly relates to a pemetrexed disodium intermediate III and a preparation method thereof. The preparation method includes the steps: adding 4-[2-(2-amino-4, 7-dihydro-4-oxygen-3H-pyrrolo[2, 3-d] pyrimidine-5-group) ethyl] benzoic acid into DMF (dimethyl formamide) and triethylamine, performing stirring and dissolving, performingreaction on mixture and R-CL, and treating a reactant to obtain an intermediate II; taking an intermediate I and the intermediate II as raw materials, performing condensation reaction under the action of N, N-carbonyl diimidazole, and performing reaction on the raw materials and p-toluenesulfonic acid to obtain the intermediate III. Amidogen is protected, impurities V generated by self-reaction are avoided, the problems of oxidation and discoloration caused by amidogen instability in reaction process are prevented, conditions are mild, yield is high, a product is stable, and practical production is facilitated.
METHOD FOR PREPARING AN INTERMEDIATE FOR PRODUCING HIGH-PURITY PEMETREXED AND METHOD FOR PRODUCING HIGH-PURITY PEMETREXED USING THE INTERMEDIATE
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Paragraph 0079, (2016/08/17)
Disclosed are a method for preparing an intermediate for producing high-purity pemetrexed and a method for producing high-purity pemetrexed using the intermediate, and more specifically, a method for preparing pemetrexed diethyl ester, which is an intermediate for producing pemetrexed, or a salt thereof with high purity, and to a method for producing pemetrexed disodium salt with high purity using the intermediate.