Novel macrocyclic molecules based on 12a-N substituted 16-membered azalides and azalactams as potential antifungal agents
摘要:
Novel macrocyclic molecules comprising sulfonyl and acyl moiety at the position N-12a of 16-membered azalides (6a-n) and azalactams (10a-r) scaffold were synthesized from cyclododecanone 1 as starting material via 5 steps and 4 steps, respectively. The antifungal activity of these compounds against Sclerotinia sclerotiorum, Pyricularia oryzae, Botlytis cinerea, Rhizoctonia solani and Phytophthora capsici were evaluated and found that compounds possessing alpha-exomethylene (6c, 6d, 6e and 6g) showed antifungal activity comparable to commercial fungicide Chlorothalonil against P. oryzae and compounds possessing p-chlorobenzoyl exhibited enhanced antifungal activity than those with other substituents against S. sclerotiorum, P. oryzae, and B. cinerea. These findings suggested that the alpha-exomethylene and p-chlorobenzoyl may be two potential pharmacological active groups with antifungal activities. (C) 2013 Elsevier Masson SAS. All rights reserved.
Novel macrocyclic molecules based on 12a-N substituted 16-membered azalides and azalactams as potential antifungal agents
摘要:
Novel macrocyclic molecules comprising sulfonyl and acyl moiety at the position N-12a of 16-membered azalides (6a-n) and azalactams (10a-r) scaffold were synthesized from cyclododecanone 1 as starting material via 5 steps and 4 steps, respectively. The antifungal activity of these compounds against Sclerotinia sclerotiorum, Pyricularia oryzae, Botlytis cinerea, Rhizoctonia solani and Phytophthora capsici were evaluated and found that compounds possessing alpha-exomethylene (6c, 6d, 6e and 6g) showed antifungal activity comparable to commercial fungicide Chlorothalonil against P. oryzae and compounds possessing p-chlorobenzoyl exhibited enhanced antifungal activity than those with other substituents against S. sclerotiorum, P. oryzae, and B. cinerea. These findings suggested that the alpha-exomethylene and p-chlorobenzoyl may be two potential pharmacological active groups with antifungal activities. (C) 2013 Elsevier Masson SAS. All rights reserved.
A novel macrolactam fungicide candidate (7B3) and a novel aza-macrolactone fungicide candidate (D1) were designed and synthesized, and the bioassay showed that both displayed excellent fungicidal activity against Rhizoctonia solani Kuhn. To elucidate the biochemical mode of action of the two compounds against R. solani and illustrate the similarities and differences of action mechanism resulting from subtle differences in structure of the two compounds, the effects of the two compounds on the ultrastructure of hyphae, electrolyte leakage, and respiration of mycelia cell suspension caused by 7B3 or D1 were studied. The results showed that the two compounds had very similar modes of action. Both induced irregular swelling of hyphae, vacuolation of cytoplasm, and thickening of cell wall. The conductivity of mycelia cell suspension increased in the presence of 7B3 or D1, which indicated that the two compounds had a similar effect on cell membrane permeability. In addition, both 7B3 and D1 were insufficient in inhibiting the respiration of mycelia.
Novel macrocyclic molecules based on 12a-N substituted 16-membered azalides and azalactams as potential antifungal agents
Novel macrocyclic molecules comprising sulfonyl and acyl moiety at the position N-12a of 16-membered azalides (6a-n) and azalactams (10a-r) scaffold were synthesized from cyclododecanone 1 as starting material via 5 steps and 4 steps, respectively. The antifungal activity of these compounds against Sclerotinia sclerotiorum, Pyricularia oryzae, Botlytis cinerea, Rhizoctonia solani and Phytophthora capsici were evaluated and found that compounds possessing alpha-exomethylene (6c, 6d, 6e and 6g) showed antifungal activity comparable to commercial fungicide Chlorothalonil against P. oryzae and compounds possessing p-chlorobenzoyl exhibited enhanced antifungal activity than those with other substituents against S. sclerotiorum, P. oryzae, and B. cinerea. These findings suggested that the alpha-exomethylene and p-chlorobenzoyl may be two potential pharmacological active groups with antifungal activities. (C) 2013 Elsevier Masson SAS. All rights reserved.