During the acid catalyzed acetalization of the 13-ketone group of daunomycinone (I) by 1,2-ethanediol or 1,3-propanediolits 7-O-alkylation also takes place. The 7-O-ω-hydroxyalkyl derivatives only are formed with 1,4-butanediol, 1,6-hexanediol or 1,4-butynediol. The conformational preference of new compounds is discussed. The (7S)-ω-hydroxyalkyl derivatives of daunomycinone are active against Bacillus subtilis, on the contrary to I and their (7R)-epimers.
在达诺霉素酮(I)的13-酮基团通过1,2-乙二醇或1,3-丙二醇进行酸催化缩聚反应时,同时也发生了7-O-烷基化。只有与1,4-丁二醇、1,6-己二醇或1,4-丁炔二醇形成的7-O-ω-羟基烷基衍生物。讨论了新化合物的构象偏好。达诺霉素酮的(7S)-ω-羟基烷基衍生物对枯草杆菌具有活性,与I及其(7R)-对映体相反。