A New Synthetic Route to Prenylphenols. Synthesis of 4′,6′-Dihydroxy-2′-alkenyloxy-3′-(3-methyl-2-butenyl)acetophenones
作者:Masao Tsukayama、Makoto Kikuchi、Syuji Yoshioka
DOI:10.1246/cl.1993.1895
日期:1993.11
The palladium-catalyzed coupling reaction of 4′,6′-bis(benzyloxy)-3′-iodo-2′-methoxyacetophenone with 2-methyl-3-butyn-2-ol gave 4′,6′-bis(benzyloxy)-3′-(3-hydroxy-3-methylbutynyl)-2′-methoxyacetophenone (5). Demethylation and bromination of the benzoate obtained from 5 with BBr3 gave 4′,6′-bis(benzoyloxy)-3′-(3-bromo-3-methylbutyl)-2′-hydroxyacetophenone (8). O-Prenylation of 8 with prenyl bromide
4',6'-双(苄氧基)-3'-碘-2'-甲氧基苯乙酮与2-甲基-3-丁炔-2-醇的钯催化偶联反应得到4',6'-双(苄氧基) -3'-(3-羟基-3-甲基丁炔基)-2'-甲氧基苯乙酮 (5)。用 BBr3 对从 5 获得的苯甲酸酯进行去甲基化和溴化,得到 4',6'-双(苯甲酰氧基)-3'-(3-溴-3-甲基丁基)-2'-羟基苯乙酮(8)。用异戊二烯溴对 8 进行 O-异戊二烯化,然后将所得化合物水解,得到 4',6'-二羟基-2'-异戊二烯氧基-3'-异戊二烯基苯乙酮。以类似的方式,4',6'-二羟基-2'-香叶氧基-3'-异戊二烯基苯乙酮也由8和香叶基溴制备。