RESUMO
The discovery and potency optimization of a series of 7-aminofuro[2,3-c]pyridine inhibitors of TAK1 is described. Micromolar hits taken from high-throughput screening were optimized for biochemical and cellular mechanistic potency to ~10nM, as exemplified by compound 12az. Application of structure-based drug design aided by co-crystal structures of TAK1 with inhibitors significantly shortened the number of iterations required for the optimization.
Assuntos
MAP Quinase Quinase Quinases/antagonistas & inibidores , Piridinas , Aminas/síntese química , Aminas/química , Aminas/farmacologia , Animais , Cristalografia por Raios X , Desenho de Fármacos , Ativação Enzimática/efeitos dos fármacos , Inibidores Enzimáticos/síntese química , Inibidores Enzimáticos/farmacocinética , Inibidores Enzimáticos/farmacologia , Furanos/síntese química , Furanos/química , Furanos/farmacologia , Humanos , Concentração Inibidora 50 , Camundongos , Estrutura Molecular , Neoplasias/tratamento farmacológico , Piridinas/síntese química , Piridinas/farmacocinética , Piridinas/farmacologia , Relação Estrutura-Atividade , Ensaios Antitumorais Modelo de XenoenxertoRESUMO
Total syntheses of (±)-securinine and (±)-allosecurinine that employ a tandem rhodium carbenoid-initiated Claisen/α-ketol rearrangement sequence as a key step are described.
Assuntos
Alcaloides/síntese química , Azepinas/síntese química , Compostos Heterocíclicos de Anel em Ponte/síntese química , Lactonas/síntese química , Piperidinas/síntese química , Alcaloides/química , Azepinas/química , Ciclização , Euphorbiaceae/química , Compostos Heterocíclicos de Anel em Ponte/química , Lactonas/química , Estrutura Molecular , Piperidinas/química , Ródio/química , EstereoisomerismoRESUMO
The synthesis of pyrano[3,4-b]indoles is described. The reaction sequence involves Sonogashira coupling of dihydropyran propargyl ether scaffolds with iodoanilines to afford intermediate indoles. Lewis acid-catalyzed ionization of the dihydropyrans, followed by intramolecular C3 alkylation of the indole, provides the title compounds.
Assuntos
Indóis/química , Alquilação , Catálise , Ciclização , Isomerismo , Estrutura Molecular , OxirreduçãoRESUMO
Substituted dihydropyrans, easily accessed from a commercially available glycal, undergo acid-catalyzed rearrangement to provide highly functionalized isochroman and dioxabicyclooctane scaffolds.
Assuntos
Piranos/química , Alcenos/química , Ciclização , ÉteresRESUMO
The dehalogenation of alkyl iodides, as well as the chemoselective deoxygenation of a secondary alcohol in the presence of various alkyl and aryl halides, can be accomplished employing a trialkylborane/air/water system.
Assuntos
Boranos/química , Água/química , Catálise , Iodetos/química , Estrutura MolecularRESUMO
Trialkylboranes (BMe3, BEt3, and BBu3) have been shown to mediate reductive deoxygenation reactions of O-alkyl-S-methyl dithiocarbonates (methyl xanthates) in which water or deuterium oxide functions as the source of hydrogen or deuterium. This method has proven versatile with regard to substrate scope and is capable of providing protio- or deuterioalkane products in high yields with excellent levels of D-incorporation. Ab initio calculations suggest that the trialkylborane-water complex possesses an unusually low O-H bond dissociation energy (73 kcal/mol) and support a radical chain mechanism for this process. Taken together, this report provides evidence for fundamentally novel and previously overlooked modes of reactivity for water and trialkylboranes of wide ranging importance in both theoretical and applied investigations.
