The present invention relates to a L-talopyranoside derivative of the formula (I): ##STR1## wherein, A is hydrogen atom, a lower alkyl group having 1 to 5 carbon atoms, or a hydroxyl-protecting group; B.sub.1 and B.sub.2, the same or different from each other, are independently hydrogen atom or a hydroxyl-protecting group; R.sub.1 and R.sub.2 may form a alkylene group with a carbon atom of 5-position of the sugar skeleton, or one of them is hydrogen atom and the other is CH.sub.2 X wherein, X is hydrogen, or a protected or un-protected hydroxyl group. Provided that, the following compounds are excepted: ##STR2## wherein, B.sub.1 and B.sub.2 are independently hydrogen atom or acetyl. L-talopyronoside derivatives of the present invention is a very useful intermediate for the synthesis of anthracycline antibiotics having an antitumor activity. The process according to the invention has an advantage of significant reduction in the production cost and therefore expected to be very useful for the preparation of anthracycline antibiotics in an industrial scale.
本发明涉及一种L-塔洛
吡喃糖苷衍
生物,其结构式如式(I)所示:##STR1##其中,A为氢原子、含有1至5个碳原子的低级烷基或羟基保护基;B1和B2彼此相同或不同,各自独立地为氢原子或羟基保护基;R1和R2可以与糖骨架5位上的碳原子形成亚烷基,或者其中之一为氢原子,另一个为CH2X,其中X为氢,或保护或未保护的羟基。但以下化合物除外:##STR2##其中,B1和B2各自独立地为氢原子或乙酰基。本发明的L-塔洛
吡喃糖苷衍
生物是合成具有抗肿瘤活性的
蒽环类抗生素的非常有用的中间体。根据本发明的工艺具有显著降低生产成本的优点,因此预计在工业规模制备
蒽环类抗生素方面非常有用。