Conversion of in situ Generated Stabilized Phosphorus Ylides to Chromene Derivatives in Solvent-Free Conditions.

ChemInform ◽  
2004 ◽  
Vol 35 (51) ◽  
Author(s):  
Ali Ramazani ◽  
Liela Yousefi ◽  
Ebrahim Ahmadi ◽  
Ali Souldozi
Keyword(s):  
Solvent Free ◽  
Phosphorus Ylides ◽  
Solvent Free Conditions

Environmentally Friendly Organic Synthesis Using Bismuth Compounds. Bismuth Trifluoromethanesulfonate-Catalyzed Allylation of Dioxolanes

2008 ◽  
Vol 61 (6) ◽  
pp. 419 ◽  
Author(s):  
Matthew J. Spafford ◽  
James E. Christensen ◽  
Matthew G. Huddle ◽  
Joshua R. Lacey ◽  
Ram S. Mohan
Keyword(s):  
Organic Synthesis ◽  
Multicomponent Reaction ◽  
Scale Up ◽  
Environmentally Friendly ◽  
Solvent Free ◽  
Bismuth Compounds ◽  
Solvent Free Conditions ◽  
In Situ Derivatization

A bismuth trifluoromethanesulfonate (triflate)-catalyzed (2.0 mol-%) multicomponent reaction involving the allylation of dioxolanes followed by in situ derivatization with anhydrides to generate highly functionalized esters has been developed under solvent-free conditions. Most reagents used to date for allylation of dioxolanes are highly corrosive and are often required in stoichiometric amounts. In contrast, the use of a relatively non-toxic and non-corrosive bismuth(iii)-based catalyst makes this methodology especially attractive for scale-up.

Ethyl acrylate conjugated polystyryl-diphenylphosphine — An extremely efficient catalyst for Henry reaction under solvent-free conditions (SolFC)

2013 ◽  
Vol 91 (4) ◽  
pp. 300-306 ◽  
Author(s):  
Lalthazuala Rokhum ◽  
Ghanashyam Bez
Keyword(s):  
Ethyl Acrylate ◽  
Solid Support ◽  
Solvent Free ◽  
Stoichiometric Ratio ◽  
Henry Reaction ◽  
Efficient Catalyst ◽  
Fast Growing ◽  
Solvent Free Conditions ◽  
Polymer Supported

Over the last few decades, the fast-growing development of polymer supported reagents has led to the synthesis of a variety of reagents on solid support. Some of the major advantages of using such reagents are that they are less hygroscopic, easy to recover, and can be recycled. Here, we have demonstrated that in situ generated ethyl acrylate conjugated polystyryl-diphenylphosphine (PDPP–EA) derived from the reaction of a mixture of polystyryl-diphenylphosphine and ethyl acrylate in a stoichiometric ratio can efficiently catalyze the synthesis of β-nitroalcohols from the reaction of aldehydes and nitroalkanes under solvent-free conditions (SolFC).

scholarly journals Investigation on the reactivity of α-azidochalcones with carboxylic acids: Formation of α-amido-1,3-diketones and highly substituted 2-(trifluoromethyl)oxazoles

2015 ◽  
Vol 11 ◽  
pp. 2021-2028 ◽  
Author(s):  
Kandasamy Rajaguru ◽  
Arumugam Mariappan ◽  
Rajendran Suresh ◽  
Periasamy Manivannan ◽  
Shanmugam Muthusubramanian
Keyword(s):  
Microwave Irradiation ◽  
Carboxylic Acids ◽  
Trifluoroacetic Acid ◽  
Solvent Free ◽  
Solvent Free Conditions ◽  
In Situ Formation ◽  
Lower Temperature

The reaction of α-azidochalcones with carboxylic acids has been investigated resulting in the formation of α-amido-1,3-diketones under microwave irradiation via in situ formation of 2H-azirine intermediates. An interesting reaction is described wherein, with trifluoroacetic acid at lower temperature, it affords highly substituted 2-(trifluoromethyl)oxazoles. These flexible transformations proceed under solvent free conditions in good to excellent yields without any catalyst.

Microwave Accelerated Wittig Reactions of Stabilized Phosphorus Ylides with Ketones under Solvent-Free Conditions

Synlett ◽  
2004 ◽  
Vol 1 (01) ◽  
pp. 93-94 ◽  
Author(s):  
Aldo Spinella ◽  
Tancredi Fortunati ◽  
Annunziata Soriente
Keyword(s):  
Solvent Free ◽  
Phosphorus Ylides ◽  
Solvent Free Conditions ◽  
Wittig Reactions

scholarly journals 1-n-Butyl-3-methylimidazolium-2-carboxylate: a versatile precatalyst for the ring-opening polymerization of ε-caprolactone and rac-lactide under solvent-free conditions

2013 ◽  
Vol 9 ◽  
pp. 647-654 ◽  
Author(s):  
Astrid Hoppe ◽  
Faten Sadaka ◽  
Claire-Hélène Brachais ◽  
Gilles Boni ◽  
Jean-Pierre Couvercelle ◽  
...  
Keyword(s):  
Differential Scanning Calorimetry ◽  
Ring Opening ◽  
Gel Permeation Chromatography ◽  
Ring Opening Polymerization ◽  
Solvent Free ◽  
Scanning Calorimetry ◽  
H Nmr ◽  
Solvent Free Conditions ◽  
Gel Permeation

The ring-opening polymerization of ε-caprolactone (ε-CL) and rac-lactide (rac-LA) under solvent-free conditions and using 1-n-butyl-3-methylimidazolium-2-carboxylate (BMIM-2-CO2) as precatalyst is described. Linear and star-branched polyesters were synthesized by successive use of benzyl alcohol, ethylene glycol, glycerol and pentaerythritol as initiator alcohols, and the products were fully characterized by 1H and 13C{1H} NMR spectroscopy, gel permeation chromatography (GPC), and differential scanning calorimetry (DSC). BMIM-2-CO2 acts as an N-heterocyclic carbene precursor, resulting from in situ decarboxylation, either by heating under vacuo (method A) or by addition of NaBPh4 (method B). Possible catalytic and deactivation mechanisms are proposed.

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