Efficient synthesis of analogs of safflower yellow B, carthamin, and its precursor: two yellow and one red dimeric pigments in safflower petals
作者:Shingo Sato、Takashi Kusakari、Tohru Suda、Takaharu Kasai、Toshihiro Kumazawa、Jun-ichi Onodera、Heitaro Obara
DOI:10.1016/j.tet.2005.07.080
日期:2005.10
of 39%, which was reacted with 2,3,4,5,6-penta-O-acetyl-aldehydo-d-glucose, glyoxylic acid, and ethyl orthoformate in the presence of base to afford the corresponding analog, 8, 12, 14, in good yields, respectively. Precursor analog 12 was then converted to carthamin analog 14 by oxidative decarboxylation by treatment with potassium permanganate as well as the natural specimen.
类似物的合成(8,12,14两和黄颜料),红花黄B和红花素的前体,和红花素本身,红色颜料,这是在生产红花(红花tinctrious L.)的花瓣和,其中有一个报告了常见的二聚喹诺酮圆锥结构。合成这些类似物的关键化合物,对苯二酚经六步合成(对羟基肉桂酸)丝绒酸(7),总收率39%,与2,3,4,5,6-五元反应- ö乙酰基醛基-d葡萄糖,二羟乙酸,和原甲酸乙酯在碱存在下,得到相应的类似物,8,12,14分别以高收成。然后通过用高锰酸钾和天然样品处理,通过氧化脱羧,将前体类似物12转化为香樟素类似物14。