Development of Bioactive Functions in Hydrangeae Dulcis Folium. VI. Syntheses of Thunberginols A and F and Their 3'-Deoxy-Derivatives Using Regiospecific Lactonization of Stilbene Carboxylic Acid: Structures and Inhibitory Activity on Histamine Release of Hydramacrophyllols A and B.
作者:Masayuki YOSHIKAWA、Hiromi SHIMADA、Nobuhiro YAGI、Nobutoshi MURAKAMI、Hiroshi SHIMODA、Johji YAMAHARA、Hisashi MATSUDA
DOI:10.1248/cpb.44.1890
日期:——
Lactonization reaction of 2-carboxystilbene mediated by copper(II) chloride proceeded regiospecifically to give the five-membered lactone, while the bromolactonizations using N-bromosuccinimide and anodic oxidation were found to furnish the six-membered lactone. Using these regiospecific lactonization reactions as a key step, antiallergic and antimicrobial isocoumarins and the benzylidenephthalides thunberginols A and F and their 3'-deoxyanalogs were synthesized from phyllodulcin and hydrangenol.Two phthalides called hydramacrophyllols A and B were isolated from Hydrangeae Dulcis Folium and their stereostructures were determined on the basis of physicochemical and chemical evidence, which included the syntheses of hydramacrophyllols A and B from hydrangenol by the application of the lactonization method using copper(II)chloride. In addition, hydramacrophyllols A and B were found to exhibit an inhibitory effect on the histamine release from rat peritoneal exudate cells induced by antigen-antibody reaction.
氯化铜(II)介导的 2-羧基二苯乙烯的内酯化反应进行了区域特异性反应,生成了五元内酯,而使用 N-溴代琥珀酰亚胺和阳极氧化进行的溴内酯化反应则生成了六元内酯。利用这些区域特异性内酯化反应作为关键步骤,从phyllodulcin 和 hydrangenol 合成了抗过敏和抗菌的异香豆素和苯亚甲基酞thunberginols A 和 F 及其 3'-deoxyanalogs 。根据物理化学和化学证据,从绣线菊叶中分离出了两种名为水飞蓟醇 A 和 B 的邻苯二甲酸盐,并确定了它们的立体结构,其中包括应用氯化铜(II)内酯化法从水飞蓟醇合成了水飞蓟醇 A 和 B。此外,还发现水合麦考酚 A 和 B 对抗原-抗体反应诱导的大鼠腹腔渗出细胞释放组胺具有抑制作用。