Glycosidic cleavage from anaerobic saponification of the heptaacetate of daunomycin hydroquinone
作者:Barbara Ann Schweitzer、Tad H. Koch
DOI:10.1021/ja00066a013
日期:1993.6
Saponification of the heptaacetate of daunomycin hydroquinone (6) with 7 equiv of lithium hydroxide to N-acetyldaunomycin hydroquinone (7) in argon-degassed tetrahydrofuran (THF)/water medium was reported earlier not to give rise to glycosidic cleavage to yield 7-deoxydaunomycinone (5) (J. Am. Chem. Soc. 1991, 113, 1373). The only product characterized after exposure to air was N-acetyldaunomycin (8)
早先报道,在氩气脱气的四氢呋喃 (THF)/水介质中,用 7 当量氢氧化锂将柔红霉素氢醌 (6) 的七乙酸酯皂化为 N-乙酰柔红霉素氢醌 (7),不会产生糖苷裂解,生成 7-脱氧柔红霉素(5) (J. Am. Chem. Soc. 1991, 113, 1373)。暴露于空气后表征的唯一产品是 N-乙酰道诺霉素 (8)。该结果被解释为反对在氢醌氧化还原状态下柔红霉素糖苷裂解的可能证据。我们现在报告,在真空中在冻融脱气的 THF/水中进行皂化产生 10% (5), 17% 8, 28% N-乙酰-5-脱氧道诺霉素 (12), 7% 7-表道诺霉素 (13) , 2% 道诺霉素 (14), 9% 2-乙酰-11-羟基-7-甲氧基-5,12-萘二酮 (15), 14% 分布在三种不明产品中