ABSTRACT
Optimization of pyrazinoindolone inhibitors of MAPKAP-K2 (MK2) provides a reasonable balance of cellular potency and physicochemical properties. Mechanistic studies support the inhibition of MK2 which is responsible for the sub-micromolar cellular efficacy.
Subject(s)
Combinatorial Chemistry Techniques , Enzyme Inhibitors/chemical synthesis , Enzyme Inhibitors/pharmacology , Indoles/chemical synthesis , Indoles/pharmacology , Intracellular Signaling Peptides and Proteins/antagonists & inhibitors , Protein Serine-Threonine Kinases/antagonists & inhibitors , Pyrazoles/chemical synthesis , Pyrazoles/pharmacology , Enzyme Inhibitors/chemistry , Indoles/chemistry , Inhibitory Concentration 50 , Molecular Structure , Pyrazoles/chemistry , Structure-Activity RelationshipABSTRACT
Trialkylphosphines furnish unusual, sometimes unique, reactivity in a range of transformations. Unfortunately, their utility is compromised by their sensitivity to oxidation. We have examined a simple but powerful strategy for addressing this problem: convert air-sensitive trialkylphosphines into air-stable phosphonium salts via protonation on phosphorus. These robust salts serve as direct replacements for the corresponding phosphines (simple deprotonation under the reaction conditions by a Brønsted base liberates the trialkylphosphine) in a diverse set of applications. [reaction: see text]
