Novel synthesis and cytotoxic activity of 1,4-disubstituted 3-methylidene-3,4-dihydroquinolin-2(1H)-ones
作者:Marlena Pięta、Jacek Kędzia、Anna Janecka、Dorota K. Pomorska、Marek Różalski、Urszula Krajewska、Tomasz Janecki
DOI:10.1039/c5ra16673j
日期:——
1,4-Disubstituted 3-methylidene-3,4-dihydroquinolin-2(1H)-ones were efficiently synthesized using a Horner–Wadsworth–Emmons approach and their cytotoxic activity was evaluated.
Nickel-Catalyzed Enantioselective Carbamoyl Iodination: A Surrogate for Carbamoyl Iodides
作者:Austin D. Marchese、Marco Wollenburg、Bijan Mirabi、Xavier Abel-Snape、Andrew Whyte、Frank Glorius、Mark Lautens
DOI:10.1021/acscatal.0c00841
日期:2020.4.17
This work reports the enantioselective formal transfer of a carbamoyl iodide across a 1,1-disubstituted styrene using Ni-catalysis. Employing an air-stable Ni(II) precatalyst and a commercially available chiral ligand ((S)-tBuPHOX), enantioenriched 3,3-disubstituted iodooxindoles were obtained in up to 90% yield and up to 97:3 e.r. This methodology was applied to the total synthesis of (−)-esermethole
Regiodivergent Ring-Expansion of Oxindoles to Quinolinones
作者:Hendrik L. Schmitt、Den Martymianov、Ori Green、Tristan Delcaillau、Young Seo Park Kim、Bill Morandi
DOI:10.1021/jacs.3c12119
日期:2024.2.21
The development of divergent methods to expedite structure–activity relationship studies is crucial to streamline discovery processes. We developed a rare example of regiodivergent ring expansion to access two regioisomers from a common starting material. To enable this regiodivergence, we identified two distinct reaction conditions for transforming oxindoles into quinolinone isomers. The presented
Direct enantioselective hydrogenation of unsaturated compounds to generate chiral three-dimensional motifs is one of the most straightforward and important approaches in synthetic chemistry. We realized the Ru(II)-NHC-catalyzed asymmetrichydrogenation of 2-quinolones under mild reaction conditions. Alkyl-, aryl- and halogen-substituted optically active dihydro-2-quinolones were obtained in high yields