Preparation method of high-purity butylphthalide
The invention relates to a preparation method of high-purity butylphthalide. The preparation method comprises the following steps: (1) preparing n-butyl magnesium bromide; (2) synthesizing 2-valerylbenzoic acid; (3) synthesizing butylphthalide; and (4) refining the butylphthalide. Due to the adoptio...
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Main Authors | , , , |
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Format | Patent |
Language | Chinese English |
Published |
20.11.2020
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Subjects | |
Online Access | Get full text |
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Summary: | The invention relates to a preparation method of high-purity butylphthalide. The preparation method comprises the following steps: (1) preparing n-butyl magnesium bromide; (2) synthesizing 2-valerylbenzoic acid; (3) synthesizing butylphthalide; and (4) refining the butylphthalide. Due to the adoption of the technical scheme, the preparation method has the advantages that the n-butyl magnesium bromide is used as an initiator in the step (1), so that the initiation condition is mild, and the safety performance is improved; and the initiation temperature is 38-42 DEG C, and the reaction temperature is only 48-52 DEG C, so that the temperature is easy to implement in the mass production process; the 2-valerylbenzoic acid is used as the raw material, and carbonyl is reduced in a sodium borohydride aqueous solution mode, so that explosion easily caused by a solid feeding mode is avoided, and production safety is guaranteed; and the butylphthalide is refined in a reduced pressure distillationmode, so that the method |
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Bibliography: | Application Number: CN202010927412 |