Process for the preparation of substituted trans-cinnamaldehyde, a natural yellow dye, from phenylpropane derivatives
申请人:——
公开号:US20020133045A1
公开(公告)日:2002-09-19
The present invention relates to the preparation of substituted trans-cinnamaldehyde, a natural yellow dye from Phenylpropane derivatives having R
2
-R
3
-R
4
-R
5
-R
6
substitution, wherein R
2
to R
6
equal or different, being hydrogen or hydroxy or acyl or halogen or alkyl or heterocyclic or aryl or dioxymethylene or alkoxy groups, etc., by oxidizing the said phenylpropane derivatives using a oxidising agent such as 2,3-dichloro-5,6-dicyano-1,4-benzoquinone (DDQ) or p-chloranil or pyridinium chlorochromate (PCC) or tBuOOH or or CrO
3
with a catalytic amount of inorganic/organic acid or alumina, celite, and silica gel as a solid support for microwave irradiation and thus substituted trans-cinnamaldehydes, a natural yellow dye, are obtained in high yield ranging from 68-82%.
本发明涉及制备取代的反式肉桂醛,一种从苯丙烷衍生物中具有R2-R3-R4-R5-R6取代的天然黄色染料,其中R2到R6相等或不同,是氢、羟基、酰基、卤素、烷基、杂环、芳基、二氧甲基或烷氧基等基团,通过使用氧化剂如2,3-二氯-5,6-二氰基-1,4-苯醌(DDQ)或对氯苯醌或氯铬酸吡啶盐(PCC)或tBuOOH或CrO3以及无机/有机酸或氧化铝、硅藻土和硅胶等固体支撑体进行微波辐射,从而高产率地获得取代的反式肉桂醛,一种天然黄色染料,产率范围为68-82%。