Practical total synthesis of 11-deoxyanthracyclinones (8 and 9) was accomplished on the basis of two effective syntheses of the key intermediates (14 and 15) and the subsequent highly stereoselective introduction of a C-7 cis-hydroxyl group. Glycosidation of 8 with a suitably protected L-daunosamine (37) followed by deprotection provided 4-demethoxy-11-deoxydaunomycin (5). The C-13 acetal derivative (34) of 9 was successfully employed for the glycosidation to achieve the first total synthesis of 11-deoxydaunomycin (6). Two novel synthetic 11-deoxyanthracyclines (10 and 11) possessing a neutral sugar instead of L-daunosamine were also synthesized.
基于两个有效的关键
中间体(14和15)的合成方法,以及随后高度立体选择性引入C-7顺式羟基,成功实现了11-
脱氧蒽环
酮(8和9)的实用全面合成。将8与适当保护的L-道诺沙敏(37)进行糖苷化,随后去保护,得到4-去甲
氧基-11-
脱氧道诺霉素(5)。9的C-13
乙缩醛衍
生物(34)成功用于糖苷化,从而实现了11-
脱氧道诺霉素(6)的首次全面合成。此外,还合成了两种新型的11-
脱氧蒽环素(10和11),它们以中性糖取代了L-道诺沙敏。