Palladium-Catalyzed Intramolecular Selenocarbamoylation of Alkynes with Carbamoselenoates: Formation of α-Alkylidene-β-lactam Framework
摘要:
Pd-catalyzed intramolecular selenocarbamoylation of alkynes leading to alpha-alkylidene-beta-lactams was developed. This reaction can be applied to thiocarbamoylation and to the synthesis of delta- and epsilon-lactams and a cyclobutanone.
A novel and efficient synthesis of 4-iminotetrahydropyrimidin-2-one derivatives was developed through a Cu(I)-catalyzed three-component tandem reaction employing propargylamines, isocyanates, and sulfonyl azides as starting materials. A wide range of polysubstituted 4-sulfonyliminotetrahydropyrimidin-2-ones, which might be useful in biological chemistry and medicinal science, were conveniently and
Synthesis of Polysubstituted Pyrroles from Activated Alkynes and<i>N</i>-Propargylamines through Base-Catalyzed Cascade Reaction
作者:Jianquan Weng、Yong Chen、Binjie Yue、Meng Xu、Hongwei Jin
DOI:10.1002/ejoc.201500166
日期:2015.5
A novel K3PO4-catalyzed synthesis of polysubstitutedpyrroles by a Michael addition/alkyne carbocyclization of activatedalkynes and N-propargylamines has been developed. This transition-metal-free cascade process represents an environmental friendly and efficient way to construct polysubstitutedpyrroles in good yields. Catalyzed by CsF, a Michael addition/aza-Claisen rearrangement/cyclization sequential
Ln[N(SiMe<sub>3</sub>)<sub>2</sub>]<sub>3</sub>-Catalyzed Cross-Diinsertion of CN/CC into an NH Bond: Facile Synthesis of 1,2,4-Trisubstituted Imidazoles from Propargylamines and Nitriles
A lanthanide‐catalyzed sequential insertion of CN and CC into an NHbond is presented. The convenient reaction, which proceeds under mild conditions, is an efficient method for preparing 1,2,4‐trisubstituted imidazoles directly from readily available propargylamines and nitriles.
reveal that 1 can efficiently catalyze the cycloaddition of propargylic amines with CO2 , exclusively affording various 2-oxazolidinones under mild conditions. It is the first eco-friendly noble-metal-free MOFs catalyst for the cyclization of propargylic amines with CO2 . DFT calculations uncover that ZnII ions can efficiently activate both C≡C bonds of propargylic amines and CO2 by coordination interaction