申请人:PURPANA (BEIJING) TECHNOLOGIES CO., LTD
公开号:US20210009532A1
公开(公告)日:2021-01-14
The present invention relates to the preparation field of azoxystrobin, and discloses a preparation method for a compound represented by formula (I). The method comprises the following steps: (1) a compound represented by formula (II) is hydrolyzed in a solvent under acidic conditions to obtain a compound represented by formula (III); and (2) the compound represented by formula (III) is reacted with a base and a methylating agent to obtain the compound represented by formula (I); in the formula, R
3
is hydrogen or C
1
-C
4
alkyl, and R
4
is C
1
-C
4
alkyl. The process for preparing azoxystrobin of the present invention not only successfully replaces trimethyl orthoformate and reduces the raw material cost, but also has high total reaction yield, and is suitable for industrial large-scale production. Experiments have proven that the yield of the prepared azoxystrobin can reach 95%.
本发明涉及阿术霉素的制备领域,并公开了一种由化学式(I)表示的化合物的制备方法。该方法包括以下步骤:(1)将由化学式(II)表示的化合物在酸性条件下在溶剂中水解,得到由化学式(III)表示的化合物;和(2)将由化学式(III)表示的化合物与碱和甲基化试剂反应,得到由化学式(I)表示的化合物;在公式中,R3为氢或C1-C4烷基,R4为C1-C4烷基。本发明的阿术霉素制备方法不仅成功替代了三甲基正甲酸酯,降低了原材料成本,而且具有高总反应产率,适合工业大规模生产。实验证明,制备的阿术霉素的产率可以达到95%。