Chemical modification of tylosin: Synthesis of amino derivatives at C-20 position of tylosin and demycarosyltylosin.

Abstract
Reductive aminations of the aldehyde group at C-20 position of tylosin and demycarosyltylosin (desmycosin) were carried out using primary and secondary amines in the presence of sodium cyanoborohydride. Some of these derivatives brought about higher antimicrobial [antibacterial] and ribosome-binding activities; the structure-activity relationship is discussed.