Simple Synthesis of Sakuranetin and Selinone <i>via</i> a Common Intermediate, Utilizing Complementary Regioselectivity in the Deacetylation of Naringenin Triacetate
作者:Yasunobu Yamashita、Kengo Hanaya、Mitsuru Shoji、Takeshi Sugai
DOI:10.1248/cpb.c16-00190
日期:——
previously isolated as a phytoalexin against rice blast disease fungus, Pyricularia oryzae, in 71% overall yield. The same intermediate, naringenin triacetate, was subjected to transesterification with 2-propanol in tetrahydrofuran, catalyzed by Candida antarctica lipase B. A contrasting regioselective preference for C-4' deacetylation was observed, giving an isomeric diacetate in 82% yield. Prenylation of the
利用三乙酸柚皮素的区域选择性脱乙酰作用成功合成了Sakuranetin和selinone。后者在40℃下用1,4-二恶烷中的咪唑在C-7处脱乙酰,得到相应的二乙酸酯,收率为80%。所获得的游离羟基的甲基化并随后除去剩余的两个乙酰基,得到了樱草苷,其先前作为抗稻瘟病真菌稻瘟病菌的植物抗毒素而被分离,总收率为71%。相同的中间体柚皮素三乙酸酯,在南极假丝酵母脂肪酶B的催化下,与2-丙醇在四氢呋喃中进行酯交换反应。观察到C-4'脱乙酰基反应的区域选择性相反,得到双乙酸异构体,产率为82%。