Antifungal agents. 5. Chemical modification of antibiotics from Polyangium cellulosum var fulvum. Alcohol, ketone, aldehyde and oxime analogs of ambruticin

Alcohol, ketone, aldehyde, and oxime analogues of ambruticin (1) were prepared. The analogues were tested against Histoplasma capsulatum, Microsporum fulvum, Candida albicans, and Streptococcus pyogenes. Structure-activity relationships are described. Increasing the bulk of substituent at C1 and C5 reduces antifungal activity.