88929-35-5Relevant articles and documents
Preparation method of 4-hydroxy-2-oxo-1-pyrrolidine acetamide
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Paragraph 0043; 0045; 0048; 0051, (2019/05/28)
The invention belongs to the technical field of drug synthesis, in particular to a preparation method of 4-hydroxy-2-oxo-1-pyrrolidine acetamide. The 4-hydroxy-2-oxo-1-pyrrolidine acetamide is produced by intramolecular dehydration of 4-hydroxy-2-oxo-1-pyrrolidine acetic acid to obtain lactone which is then reacted with ammonia water. The preparation method of the 4-hydroxy-2-oxo-1-pyrrolidine acetamide has the advantages of short reaction period, mild conditions, low production cost, high product yield, good quality and the like, so that the method is suitable for industrial large-scale production.
A synthesis process of oxiracetam
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Paragraph 0046-0049, (2019/01/16)
The invention discloses a synthetic method for an anti-senile dementia drug of oxiracetam (I), and mainly provides a novel synthetic route. The method comprises the following steps of reacting a compound (when R is -Me and NO2) shown as a formula (V) with glycinamide hydrochloride of a compound shown as a formula (VI) under an alkaline condition to obtain a compound (wherein R is -Me and NO2) shown as a formula (IV); reacting the compound (wherein R is -Me and NO2) shown as the formula (IV) with ethyl 4-chloro-3-hydroxybutyrate of a compound shown as a formula (III) to obtain a compound (wherein R is -Me and NO2) shown as a formula (II); then removing protection groups under an acidic condition and intramolecularly cyclizing to obtain a compound shown as the formula (I) of 4-hydroxy-2-oxo-1-pyrrolidine acetamide, the compound (I) being oxiracetam. According to the synthetic route, raw materials and reagents have low toxicity, low cost and easy availability. The synthetic route is simple to operate, has relatively high yield and is suitable for industrial production.
Synthesis method of oxiracetam
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Paragraph 0089; 0090; 0094, (2018/02/04)
The invention relates to a synthesis method of (S)-oxiracetam. The method comprises the following steps: (1) carrying out an esterification reaction on alcohol and S-4-amino-3-hydroxybutyrate taken as a starting material to obtain an intermediate I; (2) enabling the intermediate I and halogenated acetic ester to be subjected to a condensation reaction to obtain an intermediate II; (3) carrying out a ring closing reaction on the intermediate II to obtain an intermediate III; and (4) carrying out an ammonolysis reaction on the intermediate III to obtain the target product (S)-oxiracetam. After the synthesis route of the oxiracetam is adopted, the (S)-oxiracetam with more ideal yield of 20% or more is at least obtained; and therefore, a new oxiracetam synthesis route is opened up.