Facile Syntheses of 2H-1,2,4-Benzothiadiazine 1,1-Dioxides and 4-Oxo-3,4-dihydroquinazolines from 2-Aminobenzenesulfonamide or 2-Aminobenzamide and Aldehydes in the Presence of Sodium Hydrogen Sulfite
Ruthenium-catalysed oxidative synthesis of heterocycles from alcohols
作者:Andrew J. A. Watson、Aoife C. Maxwell、Jonathan M. J. Williams
DOI:10.1039/c1ob06516e
日期:——
Ruthenium-catalysed hydrogen transfer has been successfully used for the conversion of alcohols into either 2,3-dihydroquinazolines or quinazolines. The choice of reaction conditions allows for the selective formation of either heterocycle and the methodology can also be applied to the sulfonamide analogue.
ABSTRACT An efficient and metal-free Di-tert-butyl peroxide (DTBP)-promoted dual oxidative amination annulation of 2-amino arylsulfonamide with methylarene has been developed. This protocol provides straightforward access to benzothiadiazine 1,1-dioxide derivatives without using prefunctionalized substrates in good to excellent yields with good functional group tolerance. GRAPHICAL ABSTRACT
Aerobic primary and secondary amine oxidation cascade by a copper amine oxidase inspired catalyst
作者:Pradip Ramdas Thorve、Biplab Maji
DOI:10.1039/d0cy01764g
日期:——
Herein, we report a bioinspired catalytic system for the one-pot cascade oxidation of a native primaryamine and an in situ generated non-native secondary amine. The catalyst consists of an o-quinone cofactor phd (1,10-phenanthroline-5,6-dione) and a copper ion and operates under ambient air conditions. Quinazolin-4(3H)-ones, which are common pharmacophores present in numerous pharmaceuticals and bioactive
Transition metal-catalyzed C H functionalization of arylacetic acids for the synthesis of benzothiadiazine 1,1-dioxides
作者:Bhausaheb N. Patil、Jatin J. Lade、Aniket S. Karpe、B. Pownthurai、Kamlesh S. Vadagaonkar、V. Mohanasrinivasan、Atul C. Chaskar
DOI:10.1016/j.tetlet.2019.02.031
日期:2019.3
Copper-catalyzed practical route for the synthesis of benzothiadiazine 1,1-dioxides has been developed. The method involves CH functionalization of arylacetic acids to form aromatic aldehydes and their subsequent condensation with 2-aminobenzenesulfonamide. This functional group tolerant approach furnished benzothiadiazine 1,1-dioxidederivatives in good to excellent yields. Broad substrate scope,
Palladium-catalyzed direct C–H arylation of 3-aryl-2H-benzo[1,2,4]thiadiazine 1,1-dioxides: an efficient strategy to the synthesis of benzothiadiazine-1,1-dioxide derivatives
A new palladium-catalyzed benzothiadiazine-1,1-dioxide directarylation of C(sp2)–H bonds is described. 3-Aryl-2H-benzo[1,2,4]thiadiazine 1,1-dioxides react with various aryl iodides to give the corresponding mono-arylation products 3-(biphenyl-2-yl)-2H-benzo[1,2,4]thiadiazine 1,1-dioxides with high reactivity and regioselectivity in the presence of AgOAc. Remarkedly, the addition of TFA is crucial