Novel Synthesis of Flavonoids of Scutellaria baicalensis GEORGI.
作者:Wen-Hsin Huang、Pei-Yu Chien、Ching-Huey Yang、An-Rong Lee
DOI:10.1248/cpb.51.339
日期:——
A concise and efficient total synthesis of the flavonoids baicalein, oroxylin A and wogonin was described. Intramolecular oxidative cyclization followed by demethylation of chalcone 1, readily prepared from trimethoxyphenol, afforded, depending upon the controlled conditions, baicalein or oroxylin A in excellent yields. Demethylation of 1 yielded 3, which, by oxidation with I2/dimethyl sulfoxide (DMSO), was readily converted to oroxylin A and wogonin after column chromatography.
报道了一种简洁高效的总合成方法,用于制备黄酮类化合物黄芩素、牛心果苷A和吴萸素。通过分子内氧化环化反应,然后对查尔酮1进行脱甲基化(查尔酮1可由三甲氧基苯酚制备),根据控制条件的不同,以优异的产率得到了黄芩素或牛心果苷A。对化合物1进行脱甲基化得到3,然后通过碘/二甲基亚砜(DMSO)氧化,经柱层析后可轻松转化为牛心果苷A和吴萸素。