申请人:IDB HOLDING S.p.A.
公开号:EP0390496A1
公开(公告)日:1990-10-03
A process is provided for producing delphinidin which comprises reacting a compound of formula
wherein each Pg represents a hydroxyl protecting group, and Lg represents a leaving group with a compound of formula
wherein Pg′ represents a hydroxyl protecting group characterized in that the compound of formula VII is produced from an intermediate of formula
wherein each Pg˝ represents a hydroxyl protecting group and each Alk represents lower alkyl, by
(i) subjecting the intermediate of formula IX to hydrolysis and decarboxylation to form 3,4,5-trihydroxyacetophenone of formula
(ii) converting the 3,4,5-trihydroxyacetophenone to the compound of formula VII by introduction of the protecting groups Pg˝ and converting the group of formula -COCH₃ to a group of formula -COCH₂Lg.
本发明提供了一种生产delphinidin的工艺,该工艺包括将式化合物
其中各Pg代表羟基保护基团,Lg代表离去基团,与式VII化合物反应。
其中 Pg′ 代表羟基保护基团,其特征在于式 VII 化合物由式中间体制得
其中每个 Pg˝代表羟基保护基团,每个 Alk 代表低级烷基。
(i) 将式 IX 的中间体进行水解和脱羧以形成式 3,4,5-三羟基苯乙酮
(ii) 通过引入保护基团 Pg˝并将式-COCH₃基团转化为式-COCH₂Lg 基团,将 3,4,5-三羟基苯乙酮转化为式 VII 的化合物。