Regioselective Synthesis of 6-Alkyl- and 6-Prenylpolyhydroxyisoflavones and 6-Alkylcoumaronochromone Derivatives
作者:Masao Tsukayama、Hironari Wada、Yasuhiko Kawamura、Kazuyo Yamashita、Masaki Nishiuchi
DOI:10.1248/cpb.52.1285
日期:——
The palladium-catalyzed coupling reaction of 6-iodoisoflavone, prepared from 3′-iodoacetophenone derivative, with 2-methyl-3-butyn-2-ol gave 6-alkynylisoflavone derivative, which was hydrogenated to give 6-alkylhydroxyisoflavone (luteone hydrate) (2). Dehydration of 2 gave 2′,4′,5,7-tetrahydroxy-6-prenylisoflavone (luteone) (1). Wighteone hydrate (3) was also synthesized from 6-iodotris(benzyloxy)isoflavone in a similar manner. 6-Alkyl-4′5,7-trihydroxy-coumaronochromone (4) was synthesized by oxidative cyclization of 2 with o-chloranil.
钯催化的6-碘异黄酮与2-甲基-3-丁炔-2-醇的耦合反应,从3′-碘乙酰苯衍生物制备,生成6-炔基异黄酮衍生物,经过氢化得到6-烷基羟基异黄酮(桑酮水合物)(2)。2的脱水反应生成2′,4′,5,7-四羟基-6-异戊烯基异黄酮(桑酮)(1)。白桑酮水合物(3)也通过类似方法从6-碘三苄氧基异黄酮合成。6-烷基-4′,5,7-三羟基香豆素并色酮(4)通过2与邻氯苯醌的氧化环合反应合成。