Compounds of the formula
(wherein R1 represents an alkyl group containing from 1 to 8 carbon atoms, optionally substituted by a hydroxy, etherified hydroxy or acylated hydroxy group; R2a represents a hydrogen atom or a carboxyl esterifying group; n represents 0 or 1 and salts thereof and processes for their preparation. The compounds of formula (I) are useful as antibiotics or as intermediates for the preparation or purification of antibiotics.
Intermediates of the formula
wherein Z represents a halogen atom or a group (S)nR, or-N RxRyRz. A⊖ are also described.
式(其中 R1 代表含有 1 至 8 个
碳原子的烷基,任选被羟基、醚化羟基或酰化羟基取代;R2a 代表
氢原子或羧基
酯化基团;n 代表 0 或 1)的化合物及其盐和它们的制备工艺。 式(I)的化合物可用作
抗生素或制备或纯化
抗生素的
中间体。 还描述了式中 Z 代表卤素原子或基团 (S)nR 或-N RxRyRz. A⊖ 的
中间体。