Access to 2-Alkyl/Aryl-4-(1<i>H</i>)-Quinolones via Orthogonal “NH<sub>3</sub>” Insertion into <i>o</i>-Haloaryl Ynones: Total Synthesis of Bioactive Pseudanes, Graveoline, Graveolinine, and Waltherione F
Shweta Singh, Sharanya Nerella, Srihari Pabbaraja, Goverdhan Mehta
Abstract
An efficient one-pot synthesis of 4-(1H)-quinolones through an orthogonal engagement of diverse o-haloaryl ynones with ammonia in the presence of Cu(I), involving tandem Michael addition and ArCsp2-N coupling, is presented. The substrate scope of this convenient protocol, wherein ammonium carbonate acts as both an in situ ammonia source and a base toward diverse 2-substituted 4-(1H)-quinolones, has been mapped and its efficacy validated through concise total synthesis of bioactive natural products pseudanes (IV, VII, VIII, and XII), graveoline, graveolinine, and waltherione F.
Topics & Concepts
ChemistryArylAlkylAmmoniumSubstrate (aquarium)Total synthesisAmmoniaTandemBase (topology)Combinatorial chemistryStereochemistryAmmonium acetateMedicinal chemistryOrganic chemistryOceanographyMathematicsComposite materialMaterials scienceGeologyHigh-performance liquid chromatographyMathematical analysisSynthesis of Organic CompoundsChemical synthesis and alkaloidsCatalytic Cross-Coupling Reactions