申请人:NANJING UNIVERSITY OF TECHNOLOGY
公开号:US20140357900A1
公开(公告)日:2014-12-04
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.
揭示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,在惰性气体保护下,将2-甲基-3,3-二烷氧基-1-卤代烷与镁粉在45~65°C的温度下反应,生成格氏试剂混合物;(2)将N,N-二取代羧酰胺加入格氏试剂混合物中,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,产率高,因此具有商业价值。