Modification of Pyrazine Substitution Pattern
It was thought possible that the pyrazine moiety of the triazolopyrazine could undergo aldehyde oxidase-mediated metabolism at positions alpha- to the nitrogen. Four variations were made to the substitution of the "southernmost" (8-) ring C-H, all lowering potency vs. PfNF54.
Side chain transposition was investigated. The side-chain on the pyrazine ring was shifted to the adjacent carbon. The chain length was varied (n= 0,1,2) and linked through either O or N. Among the ethers, the phenethyl ether MMV670945 showed good potency (Pfal IC50 34 nM) but a poor stability in RLM (Cl 100 mL/min/Kg).
Tele-substitution
Add text about tele-substitution occurrences
