申请人:Nanjing University Of Technology
公开号:EP2799418A1
公开(公告)日:2014-11-05
Disclosed is a preparation method of the lycopene intermediate 3-methyl-4,4-dialkoxy-1-butaldehyde. The preparation method comprises the following steps: (1) reacting 2-methyl-3,3-dialkoxy-1-halopropane with magnesium powder in the solvent of anhydrous tetrahydrofuran at a temperature of 45~65°C to generate a mixture of Grignard reagents under the protection of an inert gas; and (2) adding N,N-disubstituted carboxamide to the mixture of Grignard reagents and reacting at a temperature of 10°C~35°C to obtain 3-methyl-4,4-dialkoxy-1-butaldehyde. The process route of the present invention is simple and direct, the operation is easy, the conditions are mild and the yield is good, and thus the invention has commercial value.
本发明公开了一种番茄红素中间体 3-甲基-4,4-二烷氧基-1-丁醛的制备方法。该制备方法包括以下步骤:(1) 在无水四氢呋喃溶剂中,将 2-甲基-3,3-二烷氧基-1-丙醛与镁粉在 45~65°C 的温度下反应,生成格氏试剂混合物; (2) 在格氏试剂混合物中加入 N,N-二取代羧酰胺,在 10°C~35°C 的温度下反应,得到 3-甲基-4,4-二烷氧基-1-丁醛。本发明的工艺路线简单直接,操作简便,条件温和,收率高,因此本发明具有商业价值。