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Diacetate protection of 5 and 6-carboxyfluorescein followed by synthesis of the N-hydroxysuccinimide esters allowed ready separation of the two isomers on a multi-gram scale. The 5 and 6-carboxyrhodamine B N-hydroxysuccinimide esters were also readily synthesised and separated.
Human neutrophil elastase (HNE) is a serine protease implicated in the pathogenesis of acute and chronic inflammatory disease. Here a series of, internally quenched, single fluorophore fluorescent reporters were synthesised that allowed the rapid, highly specific and sensitive analysis of HNE activity over closely related proteases.
The syntheses of four D-myo-inositol 1,4,5-trisphosphate (InsP(3)) derivatives, incorporating phosphate bioisosteres at the 5-position, are reported. The methyl phosphate ester and sulfate derivatives retain InsP(3) receptor (InsP(3)R) agonist activity; the compounds that possess a methylphosphonate or a carboxymethyl moiety are InsP(3)R antagonists.
The design of a range of 4-position-modified D-myo-inositol 1,4,5-trisphosphate derivatives is described. The enantioselective synthesis of these compounds is reported, along with initial biological analysis, which indicates that these compounds do not act as D-myo-inositol 1,4,5-trisphosphate receptor agonists or antagonists.