The PPh3‐catalyzed ring‐expansionreaction of sulfamate‐derived cyclic imines with acetylenedicarboxylates has been developed. The reaction works quite efficiently under very mild conditions to afford benzo[g][1,2,3]oxathiazocine‐4,5‐dicarboxylate 2,2‐dioxide derivatives in high yields.
已开发出由氨基磺酸衍生的亚胺基环状亚胺与乙炔二羧酸酯的PPh 3催化的扩环反应。该反应在非常温和的条件下非常有效地进行,以高收率提供了苯并[ g ] [1,2,3]草硫唑烷-4,5-二羧酸2,2-二氧化物衍生物。
Palladium(0)-Catalyzed Diastereoselective (3+2) Cycloadditions of Vinylcyclopropanes with Sulfonyl-Activated Imines
herein a palladium(0)-catalyzed (3+2)-cycloaddition process between vinylcyclopropanes and cyclic or acyclic sulfonylimines. This reaction, which operates under low catalyst loading and practical reaction conditions, gives access to a wide variety of N-heterocyclic derivatives in good to excellent yields and high levels of diastereoselectivity.
Lewis Base‐Brønsted Acid Co‐catalyzed Morita‐Baylis‐Hillman Reaction of Cyclic Sulfamidate Imines
作者:Gaukhar Khassenova、Olga García Mancheño
DOI:10.1002/ejoc.202100345
日期:2021.5.20
A Morita-Baylis-Hillman reaction of sulfamidate imines with a series of Michael acceptors for the efficientsynthesis of cyclic sulfamidates, bearing α,β-unsaturated chains was developed using DABCO/acetic acid as co-catalytic system. This simple approach showed a high functional group tolerance and robustness, allowing for easy upscaling and further functionalization towards densely decorated sulfamidates
Chiral Phosphoric Acid-Catalyzed Asymmetric Friedel–Crafts Addition of Indolizine to Cyclic <i>N</i>-Sulfonyl Imine
作者:Parbat Subba、Milon M. Sadhu、Vinod K. Singh
DOI:10.1021/acs.joc.3c01686
日期:2023.10.20
efficient chiral phosphoric acid-catalyzed enantioselective Friedel–Crafts addition of indolizine to cyclic N-sulfonyl imine has been established. The newly developed protocol, which probably proceeds via a monoactivation reaction pathway, allows the access of enantioenriched sulfonamide functionalized indolizines with excellent yields (up to 99%) and enantioselectivities (up to 99%). Moreover, the synthetic