A method of synthesizing 4-R-substituted anthracyclines and their corresponding salts from 4-demethyldaunorubicin includes the steps of treating 4-demethyldaunorubicin with a sulfonylating agent to form 4-demethyl-4-sulfonyl-R
3
-daunorubicin. 4-Demethyl-4-R
3
-sulfonyl-daunorubicin is then subject to a reducing agent in the presence of a transition metal catalyst in a temperature range of about 30° C. to about 100° C. in a polar aprotic solvent in an inert atmosphere. Protected 4-demethoxy-4-R-daunomycin then undergoes hydrolysis in a basic solution to form the 4-R-substituted anthracyclines. The novel method lacks the step of forming a stereospecific glycoside bond between aglycone and aminoglycoside. The method also increases the yield of the final product up to 30 to 40%.
一种从4-去甲基
多柔比星合成4-R-取代
蒽环素及其相应盐的方法,包括以下步骤:用磺酰化试剂处理4-去甲基
多柔比星,形成4-去甲基-4-磺酰基-R3-
多柔比星。然后,在惰性气氛下,在极性无
水溶剂中,在约30℃至约100℃的温度范围内,用过渡
金属催化剂对4-去甲基-4-R3-磺酰基-
多柔比星进行还原。保护的4-去甲氧基-4-R-多柔霉素然后在碱性溶液中经过
水解,形成4-R-取代
蒽环素。这种新方法省略了在缺乏立体特异性的情况下形成脱糖基和
氨基糖苷之间的立体特异性糖苷键的步骤。该方法还将最终产物的产率提高了30%至40%。