RESUMEN
Polysubstituted 5- and 6-membered carbocycles were synthesized by the title reaction. The one-pot dynamic relay process generates four new stereocenters, including a quaternary carbon center, in a highly enantioselective fashion (99.5:0.5â99:0.5 e.r.) by using a simple combination of palladium and chiral amine co-catalysts.
Asunto(s)
Aminas/química , Hidrocarburos Cíclicos/síntesis química , Paladio/química , Aldehídos , Catálisis , Ciclización , Hidrocarburos Cíclicos/química , Estructura Molecular , Estructura Cuaternaria de Proteína , EstereoisomerismoRESUMEN
Inhibition of the S-adenosyl methionine (SAM)-producing metabolic enzyme, methionine adenosyltransferase 2A (MAT2A), has received significant interest in the field of medicinal chemistry due to its implication as a synthetic lethal target in cancers with the deletion of the methylthioadenosine phosphorylase (MTAP) gene. Here, we report the identification of novel MAT2A inhibitors with distinct in vivo properties that may enhance their utility in treating patients. Following a high-throughput screening, we successfully applied the structure-based design lessons from our first-in-class MAT2A inhibitor, AG-270, to rapidly redesign and optimize our initial hit into two new lead compounds: a brain-penetrant compound, AGI-41998, and a potent, but limited brain-penetrant compound, AGI-43192. We hope that the identification and first disclosure of brain-penetrant MAT2A inhibitors will create new opportunities to explore the potential therapeutic effects of SAM modulation in the central nervous system (CNS).
Asunto(s)
Metionina Adenosiltransferasa , Neoplasias , Encéfalo/metabolismo , Diseño de Fármacos , Humanos , Neoplasias/tratamiento farmacológico , S-Adenosilmetionina/metabolismoRESUMEN
This paper describes an unexpected and novel nucleophilic phosphine-catalyzed annulation of ethyl (arylimino)acetates to give polysubstituted oxoimidazolidine derivatives in moderate to good yields from simple and easily available starting materials under mild conditions. In this reaction, the addition of methyl vinyl ketone (MVK) is essential to induce the formation of oxoimidazolidines.
Asunto(s)
Acetatos/química , Imidazolidinas/síntesis química , Fosfinas/química , Catálisis , TemperaturaAsunto(s)
Aldehídos/química , Aminas/química , Paladio/química , Ácidos Borónicos/química , Catálisis , EstereoisomerismoRESUMEN
The asymmetric arylation of N-tosylimines with arylboronic acids was realized by using chiral cationic C(2)-symmetric N-heterocyclic carbene (NHC) Pd(2+) diaquo complex 5b as the catalyst in combination with 1.0 equiv of K(3)PO(4) x 3 H(2)O in THF at 4 degrees C in the presence of powdered 4 A MS to afford the corresponding adducts in excellent yields (up to 99%) and good to high enantioselectivities (up to 94% ee).
RESUMEN
Significant progress in the development of the Morita-Baylis-Hillman (MBH) reaction has been made in the past decade. Many new variations of the MBH reaction have been well exploited, affording unexpected products and novel cyclized adducts in some cases, known as "abnormal MBH reactions". The formation of abnormal MBH adducts depends on the nature of the substrates and the employed catalytic system. This article will summarize recent advances in and mechanistic insights into such "abnormal" MBH reactions, including double-MBH reactions, sila-MBH reactions, abnormal aza-MBH reactions and tandem MBH pathways.
RESUMEN
The bifunctional chiral phosphine Lewis base (R)-2'-diphenylphosphino-[1,1'-binaphthalene]-2-ol is an effective organocatalyst in the asymmetric aza-MBH reaction of ethyl (arylimino)acetates 1 with MVK and EVK to give the corresponding adducts in moderate to good yields and good to high enantiomeric excesses under mild conditions.