The title compound, (+)-14,14-difluoro-4-demethoxydaunorubicin hydrochloride (9), was prepared starting from the readily available (−)-hydroxy ester (10). This synthesis featured the efficient synthetic route to (−)-14,14-difluoro-4-demethoxy-7-deoxydaunomycinone (20) employing the Reformatsky reaction of ethyl bromodifluoroacetate with the (−)-siloxy aldehyde (14) and previously developed glycosylation method in which trimethylsilyl trifluoromethanesulfonate was used as an activator. In P388 in vitro test, 9 was found to be fifty times more active than adriamycin (1). Prominent antitumor activity was also observed for 9 in P388 in vivo test.
标题化合物(+)-14,14-二
氟-4-去甲氧基
多柔比星盐酸盐(9)是从易得的(−)-羟基酯(10)开始制备的。这一合成采用了高效的合成路线,通过Reformatsky反应,将乙基
溴二氟乙酸酯与(−)-
硅氧基醛(14)反应,合成了(−)-14,14-二
氟-4-去甲氧基-7-脱氧多柔比糖酮(20)。同时, previously开发的糖基化方法中使用了三甲基
硅基
三氟甲磺酸盐作为活化剂。在P388体外测试中,发现9的活性是
多柔比星(1)的五十倍。在P388体内测试中,9也表现出了明显的抗肿瘤活性。