Synthesis and evaluation of small libraries of triazolylmethoxy chalcones, flavanones and 2-aminopyrimidines as inhibitors of mycobacterial FAS-II and PknG

A synthetic strategy to access small libraries of triazolylmethoxy chalcones 4{1–20}, triazolylmethoxy flavanones 5{1–10} and triazolylmethoxy aminopyrimidines 6{1–17} from a common substrate 4-propargyloxy-2-hydroxy acetophenone using a set of different reactions has been developed. The chalcones and flavanones were screened against mycobacterial FAS-II pathway using a recombinant mycobacterial strain, against which the most potent compound showed ∼88% inhibition in bacterial growth and substantially induction of reporter gene activity at 100μM concentration. The triazolylmethoxy aminopyrimdines were screened against PknG of Mycobaceterium tuberculosis displaying moderate to good activity (23–53% inhibition at 100μM), comparable to the action of a standard inhibitor.