synthesized as reversible thiol conjugateaddition acceptors. These thia-conjugate additions can rapidly and reversibly achieve equilibrium under aqueous conditions at neutral pH. Kinetic studies show that electron-withdrawing groups at the 4-position of the phenyl ring of the benzalcyanoacetamides promote the conjugateaddition at equilibrium. Dynamic thiol exchange of these conjugate acceptors is faster
Oxidative Olefination of Benzylamine with an Active Methylene Compound Mediated by Hypervalent Iodine (III)
作者:Bapurao D. Rupanawar、Sruthi M. Veetil、Gurunath Suryavanshi
DOI:10.1002/ejoc.201900970
日期:2019.9.30
Hypervalent iodine mediates the oxidative olefination of amines with activemethylenecompounds for the formation of electrophilic alkenes under mild reaction conditions in good to excellent yields.
高价碘介导胺与活性亚甲基化合物的氧化烯化反应,可在温和的反应条件下以良好至极好的收率形成亲电烯烃。
Triflic acid-catalyzed metal-free synthesis of (<i>E</i>)-2-cyanoacrylamides and 3-substituted azetidine-2,4-diones
作者:Bapurao D. Rupanwar、Santosh S. Chavan、Anil M. Shelke、Gurunath M. Suryavanshi
DOI:10.1039/c7nj05169g
日期:——
efficient synthesis of biologically active (E)-2-cyanoacrylamides and 3-substituted azetidine-2,4-diones has been reported with 64–94% yields under metal-free conditions. The reaction proceeds through sequential Knoevenagel condensation/stereoselective in situ monohydration of nitrile or C–N cyclization protocol in one-pot. The attractive features of this tandem process are moderate reaction conditions
A facile and efficient route for the homogeneous and highly stereoselective monohydration of substituted methylenemalononitriles to (E)-2-cyanoacrylamides catalyzed by copper(II) acetate monohydrate in acetic acid containing 2% water is described, and a mechanism is proposed. The protocol has proved to be suitable for the monohydration of dicyanobenzenes and 2-substituted malononitriles.
EL-BAYOUKI, KHAIRY;HAMMAD, M., EGYPT. J. CHEM., 1978, 21, N 2, 171-177