摘要
对以4 - 羟基苯甲醛为原料合成3 - 甲氧基- 4 - 羟基苯甲醛的工艺进行了改进研究,其中包括以氯化溴代替溴素为溴化剂和以甲醇+ DMF( 体积比甲醇∶DMF= 6∶1) 代替DMF 作为甲氧基化反应的溶剂,从而为降低生产成本提供了很好的条件。最后,溴化一步3 - 溴- 4 - 羟基苯甲醛收率达93 .3 % ,甲氧基化一步3 - 溴- 4 - 羟基苯甲醛转化率达96 .7 % 。
The method of synthetizing 3-methoxy-4-hydroxybenzaldehyde from 4-hydroxybenzaldehyde was improved,which include using BrCl as the reagent of bromination and using methanol as the solvent of methoxylation reaction.At last,the yield of 3-bromo-4-hydroxybenzaldehyde was 93.3% and 96.7% 3-bromo-4-hydroxybenzaldehyde could be converted into 3-methoxy-4-hydroxybenzaldehyde.
关键词
溴化
甲氧基化
羟基苯甲醛
香兰素
香料
bromination
methoxylation
3-methoxy-4-hydroxybenzaldehyde