The present invention pertains to a simple route to prepare (+)-Totarol from (-)-Sclareol. As intermediate a compound according to formula (I) is used.
Compound (I) is reacted with potassium-tert-butylate, suspended in tert-butanol under a oxygen free atmosphere at the boiling temperature of the mixture; then isopropyl iodide is added and the reaction product (II) is separated;
As second step the compound (II) is suspended in acetonitrile and then reacted in an oxygen free atmosphere with a blend of LiBr and CuBr2, heated to reflux to form (+)-Totarol.
本发明涉及一种从 (-)-Sclareol 制备 (+)-Totarol 的简单方法。作为中间体使用的是符合式 (I) 的化合物。
在混合物的沸腾温度下,在无
氧气氛中将化合物(I)与悬浮在
叔丁醇中的叔
丁酸钾反应,然后加入
碘化异
丙酯,分离反应产物(II);
第二步,将化合物(II)悬浮在
乙腈中,然后在无氧环境下与 LiBr 和 CuBr2 的混合物反应,加热至回流,生成 (+)-Totarol 。