1137-71-9Relevant articles and documents
Novel method for preparing drotaverine hydrochloride intermediate
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Paragraph 0064-0070, (2020/06/16)
The invention discloses a novel method for preparing a drotaverine hydrochloride intermediate, belonging to the technical field of medicine synthesis. The preparation method comprises the following steps: preparing an intermediate 3,4-diethoxyphenylacetic acid with 1,2-diethoxybenzene as a raw material, and preparing the intermediate 3,4-diethoxyphenylacetamide with 3,4-diethoxyphenylacetic acid as a raw material. According to the novel process for preparing the drotaverine hydrochloride intermediate, a method for directly preparing 3,4-diethoxyphenylacetic acid and 3,4-diethoxyphenylethylamine is adopted, and a process for preparing 3,4-diethoxyphenylacetonitrile is avoided, so a reaction step of using sodium cyanide is avoided.
Acetylation of aromatic ethers using acetic anhydride over solid acid catalysts in a solvent-free system. Scope of the reaction for substituted ethers
Smith, Keith,El-Hiti, Gamal A.,Jayne, Anthony J.,Butters, Michael
, p. 1560 - 1564 (2007/10/03)
The acetylation of aryl ethers using acetic anhydride in the presence of zeolites under modest conditions in a solvent-free system gave the corresponding para-acetylated products in high yields. The zeolite can be recovered, regenerated and reused to give almost the same yields as that given when fresh zeolite is used.
Triazine derivatives, a process for preparing the derivatives, and herbicides containing the derivatives as the effective component
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, (2008/06/13)
A triazine derivative represented by the general formula: STR1 wherein R1 and R2 are each an alkyl group having 1 to 4 carbon atoms, and X1 and X2 are each a halogen atom, an alkyl group having 1 to 4 carbon atoms, an alkoxyl group having 1 to 4 carbon atoms, or an alkylthio group having 1 to 4 carbon atoms. This invention also provides a process for efficiently preparing said triazine derivative and a herbicide containing said triazine derivative as effective component.