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Five novel 3-hydroxyl derivatives of sixteen-membered macrolide possessing 4-O-acyl-alpha-L-cladinose as a neutral sugar moiety were synthesized by using a combination of structurally stable silyl acetal protection and selective hydrogenolysis of a 3"-methylthiomethyl ether to a 3"-OMe group. Several derivatives having n-butyryl, i-butyryl and n-valeryl substituent at the 4"-OH group exhibited significant antibacterial activity in vitro. One of them, 4"-O-n-butyryl-3"-O-methylleucomycin V, showed improved therapeutic effect in mice.

journal of antibiotics

Cladinose Analogues of Sixteen-membered Macrolide Antibiotics. VI. Synthesis of Metabolically Programmed, Highly Potent Analogues of Sixteen-membered Macrolide Antibiotics.