The coumarinolignoid cleomiscosin A (1), having antitumor activity, has been synthesized via the keto-ester (10), which was prepared from readily available starting materials (6 and 9). Removal of the methoxymethyl group of 10 followed by reduction with lithium borohydride gave a mixture of diols (12a, b). Treatment of 12a, b with 5% sulfuric acid in acetic acid provided cleomiscosin A monoacetate (14) and subsequent hydrolysis with sodium hydroxide afforded 1.
具有抗肿瘤活性的
香豆素木犀草素 A (1) 是通过
酮酯 (10) 合成的,
酮酯是用现成的起始原料(6 和 9)制备的。去除 10 的甲氧基甲基,然后用
硼氢化
锂还原,得到二元醇混合物(12a、b)。用
醋酸中的 5%
硫酸处理 12a、b,可得到单
乙酸半
木犀草苷 A(14),随后用
氢氧化钠水解可得到 1。