申请人:Roussel Uclaf
公开号:US05198571A1
公开(公告)日:1993-03-30
A region-specific monofunctionalization of a phenolic hydroxy onto a polyphenol for the preparation of a compound of the formula ##STR1## wherein R is selected from the group consisting of hydrogen, alkyl of 1 to 8 carbon atoms, alkenyl and alkynyl of 2 to 8 carbon atoms, --CN, formyl, carboxy, alkoxy carbonyl of up to 9 carbon atoms, aralkoxy carbonyl or up to 12 carbon atoms and halogen and R' is a hydroxy protective group comprising reacting a polyphenol of the formula ##STR2## wherein R has the above definition with a base to form the corresponding dianion, reacting the latter with a trialkyl borate of the formula B(OAlk).sub.3 wherein Alk is alkyl of 1 to 6 carbon atoms to form a compound of the formula ##STR3## reacting the latter with a reagent capable of introducing a hydroxy protective group and reacting the latter with a hydrolysis agent for the oxygen-boron bond to obtain the corresponding compound of Formula I.
将酚羟基的区域特异性单功能化成多酚,用于制备化合物的公式 ##STR1## 其中 R 从氢、1至8个碳原子的烷基、2至8个碳原子的烯烃和炔烃、--CN、甲酰基、羧基、长达9个碳原子的烷氧基羰基、长达12个碳原子的芳基氧基羰基或卤素中选择,R' 是包括与碱反应以形成相应的二阴离子的多酚的羟基保护基团,反应后得到公式 ##STR2## 其中 R 具有上述定义,与碱反应形成相应的二阴离子,将后者与公式 B(OAlk).sub.3 的三烷基硼酸酯(其中 Alk 是1至6个碳原子的烷基)反应,形成公式 ##STR3## 将后者与能引入羟基保护基团的试剂反应,并将后者与氧硼键的水解剂反应,以获得相应的公式 I 化合物。