Novel antibiotics of the formula: ##STR1## and its salts, esters and amides wherein R is acyl; B is H, OMe, Me or SR wherein R is lower alkyl or aryl; A.sup.1 is hydrogen, hydroxy, or an organic group; and, X is a divalent radical selected from --O--, --CH.sub.2 --, or --NY-- where Y is hydrogen or lower alkyl of from 1 to 6 carbon atoms such as methyl, ethyl, i-propyl, n-butyl, n-pentyl, n-hexyl and the like, formyl or benzyl. This invention is directed to novel antibiotics, novel intermediates useful in their preparation, and processes for preparing the novel antibiotics. The novel antibiotics are effective against gram-negative bacteria including Proteus vulgaris, E. coli and Salmonella schottmulleri, and gram-positive bacteria including Staphylococcus aureus and Bacillus subtilis and are useful in combatting bacterial infections in animals or humans in addition to various industrial applications.
新型抗生素的
化学式为:##STR1##及其盐、酯和酰胺,其中R为酰基;B为H、OMe、Me或SR,其中R为低碳基或芳基;A.sup.1为氢、羟基或有机基团;X为二价基团,选择自--O--、--CH.sub.2--或--NY--,其中Y为氢或1至6个碳原子的低碳基,例如甲基、乙基、异丙基、正丁基、正戊基、正己基等、甲酰基或苄基。本发明涉及新型抗生素、其制备有用的新型中间体以及制备新型抗生素的方法。新型抗生素对革兰氏阴性菌包括普通变形杆菌、大肠杆菌和沙门氏菌以及革兰氏阳性菌包括
金黄色葡萄球菌和枯草杆菌等都有效,可用于治疗动物或人类的细菌感染,此外还可用于各种工业应用。