19394-06-0Relevant academic research and scientific papers
A biologically inspired CuI/topaquinone-like co-catalytic system for the highly atom-economical aerobic oxidation of primary amines to imines
Largeron, Martine,Fleury, Maurice-Bernard
scheme or table, p. 5409 - 5412 (2012/06/18)
Acting together: Low catalytic amounts of CuI and topaquinone-like catalyst 1ox (see scheme) are sufficient to activate the α-C-H bond of primary amines, which are converted into alkylated imines under ambient conditions. This atom-economical process tolerates the presence of various reactive functional groups and allows selective cross-coupling of two amines. Copyright
Structural studies on bioactive compounds. 34.1 Design, synthesis, and biological evaluation of triazenyl-substituted pyrimethamine inhibitors of Pneumocystis carinii dihydrofolate reductase
Chan,Laughton,Queener,Stevens
, p. 2555 - 2564 (2007/10/03)
The triazenyl-pyrimethamine derivative 3a (TAB), a potent and selective inhibitor of Pneumocystis carinii DHFR, was selected as the starting point for a lead optimization study. Molecular modeling studies, corroborated by a recent crystal structure determination of the ternary complex of P. carinii DHFR-NADPH bound to TAB, predicted that modifications to the acetoxy residue of the lead inhibitor could exploit binding opportunities in the vicinity of an active site pocket bounded by residues Ile33, Lys37, and Leu72. Substitutions in the benzyl moiety with electron-donating and electron-withdrawing groups were predicted to probe face-edge interactions with amino acid Phe69 unique to the P. carinii enzyme. New triazenes 10a-v and 12a-f were prepared by coupling the diazonium tetrafluoroborate salt 6b of aminopyrimethamine with substituted benzylamines or phenethylamines. The most potent of the new inhibitors against P. carinii DHFR was the naphthylmethyl-substituted triazene 10t (IC50: 0.053 μM), but a more substantial increase in potency against the rat liver DHFR led to a reduction in selectivity (ratio rat liver DHFR IC50/P. carinii DHFR IC50: 5.36) compared to the original lead structure 3a (ratio rat liver DHFR IC50/P. carinii DHFR IC50: 114).
