A New Biginelli Reaction Procedure Using Potassium Hydrogen Sulfate as the Promoter for an Efficient Synthesis of 3,4-Dihydropyrimidin-2(1<i>H</i>)-one
conditions have been found to carry out the Biginellireaction for the synthesis of 3,4-dihydropyrimidin-2(1H)-one derivatives. This synthesis was performed usingpotassiumhydrogensulfate as the promoter in glycol solution. Compared with the classical Biginellireaction conditions, this new method has the advantage of excellent yields (85-99%) and short reaction time (0.5-2 h).
A One-Pot Synthesis of 3,4-Dihydropyrimidin-2-(1H)-ones from Primary Alcohols Promoted by Bi(NO3)3·5H2O in Two Different Media: Organic Solvent and Ionic Liquid
作者:Ahmad Reza Khosropour、Ahmad R. Khosropour、Mohammd M. Khodaei、Mojtaba Beygzadeh、Mahbubeh Jokar
DOI:10.3987/com-04-10257
日期:——
A new, simple and efficientprocedure for the one-pot conversion of alcohols instead of aldehydes to the corresponding 3,4-dihydropyrimidin-2(1H)-ones (DHPMs) with Bi(NO 3 ) 3 .5H 2 O as a commercially available, inexpensive, stable and non-toxic reagent in two media, acetonitrile (as an organic solvent) and tetrabutylammonium bromide (as an ionic liquid) is described. This one-pot oxidation-cyclocondensation
作者:Dominik Gärtner、André Luiz Stein、Sabine Grupe、Johannes Arp、Axel Jacobi von Wangelin
DOI:10.1002/anie.201504524
日期:2015.9.1
unreactive in cross‐coupling reactions which mostly employ more electrophilic halides or activated esters (triflates, tosylates). Acetates are cheap and easily accessible electrophiles but have not been used in cross‐couplings because the strong CO bond and high propensity to engage in unwanted acetylation and deprotonation. Reported herein is a selective iron‐catalyzedcross‐coupling of diverse alkenyl
Parallel synthesis of dihydropyrimidinones using Yb(III)-resin and polymer-supported scavengers under solvent-free conditions. A green chemistry approach to the Biginelli reaction
作者:Alessandro Dondoni、Alessandro Massi
DOI:10.1016/s0040-4039(01)01728-2
日期:2001.11
An efficient synthesis of an array of 3,4-dihydropyrimidin-2-(1H)-ones using solid-supported ytterbium(III) reagent from aldehydes, 1,3-dicarbonyl compounds and urea (Biginellireaction) under solvent-free conditions is described. Purification of each member of the library was carried out using a cocktail of acid and basic polymer-supported scavengers
Synthesis of Biginelli Compounds Using Cobalt Hydrogen Sulfate
作者:Hamid Reza Memarian、Mahnaz Ranjbar
DOI:10.1002/jccs.201190016
日期:2011.8
Efficient synthesis of various 2‐oxo(thioxo)‐1,2,3,4‐tetrahydropyrimidines containing acetyl, carboethoxy, carbomethoxy and carboxamide groups on 5‐position of the N1‐substituted and N1‐unsubstituted heterocyclic ring was achieved using cobalt hydrogen sulfate Co(HSO4)2 under thermal conditions. Good to high yield, shorter reaction times, easy work up and simple preparation of Co(HSO4)2 are the advantages