Pyridine-Mediated <i>N</i>-Vinylation of Heterocyclic Compounds: A Mild, Stereoselective and General Synthesis
作者:Azam Shahraki、Alireza Hassanabadi
DOI:10.3184/174751914x14112003835373
日期:2014.10
A good yield from the stereoselective synthesis of N-vinylated heterocyclic compounds is described involving the reaction of acetylenicesters and NH heterocyclic compounds in the presence of pyridine. This one-pot method is simple, effective under mild conditions and affords excellent yields.
[image omitted] A diastereospecific synthesis of N-vinyl heterocyclic compounds is described from a reaction of dialkyl acetylenedicarboxylate and N-H heterocyclic compounds, such as phthalimide, saccharin, 3(2H)-pyridazinone, isatin, maleimide, 2,4-thiazolidinedione, 2-benzoxazolinione and 6-chloro-2-benzoxazolinione, in the presence of triphenylarsine as an efficient catalyst, in excellent yield. The presented one-pot method is simple and effective with mild conditions.
Experimental and theoretical approaches on the reaction mechanism and kinetics of dimethyl 2-(6-oxopyridazin-1(6H)-yl)fumarate: Micelle and salt effects
four times. Sodiumdodecylsulfate (SDS) as an anionic micelle was added to the solution, and the reaction rate decreased by half. The first and second steps (k1 and k2) of the reaction mechanism become observable in the UV – Vis spectrum when SDS was added to the reaction medium, this observation creates new information regarding the reaction mechanism. Activation energy and its related parameters