Synthesis of 2-Aryl-4-Thioxo-4H-Naphtho[2,3-e][1,3]Oxazine-5,10-Dione under Solvent-Free Conditions at Ambient Temperature

2019 ◽  
pp. 1-7 ◽  
Author(s):  
Dadmohammad Balouchzehi ◽  
Alireza Hassanabadi
Keyword(s):  
Ambient Temperature ◽  
Solvent Free ◽  
Solvent Free Conditions

Synthesis of 1H-Chromeno[2,3-d]Pyrimidine-5-Carboxamides under Solvent-Free Conditions at Ambient Temperature

2017 ◽  
Vol 41 (2) ◽  
pp. 85-87 ◽  
Author(s):  
Ghodsyeh Keykha ◽  
Mohammad R. Hosseini-Tabatabaei ◽  
Alireza Hassanabadi
Keyword(s):  
Ambient Temperature ◽  
Present Method ◽  
Barbituric Acid ◽  
Condensation Product ◽  
Solvent Free ◽  
One Pot ◽  
Short Reaction Time ◽  
Alkyl Isocyanide ◽  
Solvent Free Conditions ◽  
Work Up

Good yields of six 1H-chromeno[2,3-d]pyrimidine-5-carboxamides were obtained via the two-stage, one-pot reaction of an alkyl isocyanide with the initially formed condensation product of 1,3-dimethyl barbituric acid and a salicylaldehyde under solvent-free conditions at ambient temperature. This procedure has a number of advantages, such as short reaction time and easy work-up. Also, the present method does not involve any hazardous organic solvent.

Synthesis of 4-selenylidene-4H,5H-chromeno[3,4-e][1,3]oxazin-5-one

2017 ◽  
Vol 41 (8) ◽  
pp. 452-454 ◽  
Author(s):  
Rahele Zhiani
Keyword(s):  
Ambient Temperature ◽  
Solvent Free ◽  
Efficient Synthesis ◽  
One Pot ◽  
Acyl Chlorides ◽  
Solvent Free Conditions ◽  
One Pot Condensation

A green and efficient synthesis of [1,3]oxazines has been achieved via a three-component, one-pot condensation of 4-hydroxycoumarin, potassium selenocyanate and acyl chlorides in the presence of N-methylimidazole under solvent-free conditions at ambient temperature.

Synthesis of 1,1-diacetates catalysed by silica-supported boron sulfonic acid under solvent-free conditions and ambient temperature

2014 ◽  
Vol 68 (4) ◽  
Author(s):  
Sami Sajjadifar ◽  
Sobhan Rezayati
Keyword(s):  
Acetic Anhydride ◽  
Ambient Temperature ◽  
Sulfonic Acid ◽  
Acid Catalyst ◽  
Solvent Free ◽  
Solvent Free Conditions ◽  
Brønsted Acid Catalyst ◽  
Ready Availability ◽  
Salient Features ◽  
Direct Condensation

Abstract1,1-Diacetates derivatives were prepared using the direct condensation of aldehydes with acetic anhydride in the presence of silica-supported boron sulfonic acid (SiO2/B(SO4H)3) as a tri-functional inorganic Brønsted acid catalyst under solvent-free conditions at ambient temperature. The salient features of this methodology are: (i) cheaper process ready availability of the catalyst; (ii) versatility; (iii) high regio-selectivity of the procedure and recyclable property of the catalyst.

Ruthenium(III) acetylacetonate [Ru(acac)3] — An efficient chemoselective catalyst for the tetrahydropyranylation (THP) of alcohols and phenols under solvent-free conditions

2006 ◽  
Vol 84 (9) ◽  
pp. 1174-1179 ◽  
Author(s):  
Ravi Varala ◽  
Srinivas R Adapa
Keyword(s):  
Ambient Temperature ◽  
Catalytic Amount ◽  
Solvent Free ◽  
Protecting Groups ◽  
Solvent Free Conditions ◽  
Different Types

A catalytic amount of ruthenium(III) acetylacetonate (2 mol%) [Ru(acac)3] enables solvent-free tetrahydropyranylation of different types of alcohols and phenols at ambient temperature in moderate to excellent yields. Notably, selective monoprotection of diols can be achieved chemoselectively. Furthermore, the catalyst could be recovered and reused if necessary.Key words: tetrahydropyranyl ethers, protecting groups, ruthenium(III) acetylacetonate, alcohols, thiols.

Efficient Synthetic Method for β-Enamino Esters Catalyzed by Yb(OTf)3 under Solvent-Free Conditions

2006 ◽  
Vol 59 (12) ◽  
pp. 921 ◽  
Author(s):  
Ravi Varala ◽  
Sreelatha Nuvula ◽  
Srinivas R. Adapa
Keyword(s):  
Ambient Temperature ◽  
Solvent Free ◽  
Synthetic Method ◽  
Dicarbonyl Compounds ◽  
Solvent Free Conditions ◽  
Wide Range ◽  
Reaction Proceeds

A wide range of β-enamino esters have been synthesized in moderate to excellent yields by reacting 1,3-dicarbonyl compounds with amines in the presence of catalytic amounts of Yb(OTf)3 (2 mol%). The reaction proceeds smoothly at ambient temperature under solvent-free conditions. The catalyst can be recovered and reused.

Catalytic metallodendrimers grafted on mesoporous polymethacrylate beads for the regioselective synthesis of β-amino alcohols under solvent-free conditions

RSC Advances ◽  
2015 ◽  
Vol 5 (53) ◽  
pp. 42526-42535 ◽  
Author(s):  
Richa Tiwari ◽  
Sachdeo H. Daware ◽  
Sandeep B. Kale
Keyword(s):  
Ambient Temperature ◽  
Amino Alcohols ◽  
Catalytic Synthesis ◽  
Solvent Free ◽  
Regioselective Synthesis ◽  
Solvent Free Conditions

Metallodendrimer-grafted mesoporous polymethyacrylate beads for the regioselective, solvent-free, efficient and scalable catalytic synthesis of β-amino alcohols at ambient temperature.

scholarly journals Highly Efficient and Ambient-Temperature Synthesis of Benzimidazoles via Co(III)/Co(II)-Mediated Redox Catalysis

Catalysts ◽  
2022 ◽  
Vol 12 (1) ◽  
pp. 59
Author(s):  
Renyuan Zhong ◽  
Wulin Xiong ◽  
Haoyuan Zhang ◽  
Tongtong Zeng ◽  
Shanshan Gong ◽  
...  
Keyword(s):  
Hydrogen Peroxide ◽  
Ambient Temperature ◽  
Efficient Method ◽  
Solvent Free ◽  
Redox Catalysis ◽  
Temperature Synthesis ◽  
Fast Green ◽  
Stoichiometric Amount ◽  
Highly Efficient ◽  
Solvent Free Conditions

An efficient method for ambient-temperature synthesis of a variety of 2-substituted and 1,2-disubstituted benzimidazoles from aldehyde and phenylenediamine substrates has been developed by utilizing Co(III)/Co(II)-mediated redox catalysis. The combination of only 1 mol% of Co(acac)2 and stoichiometric amount of hydrogen peroxide provides a fast, green, and mild access to a diversity of benzimidazoles under solvent-free conditions.

Synthesis of pyranopyrazoles, benzopyrans, amino-2-chromenes and dihydropyrano[c]chromenes using ionic liquid with dual Brønsted acidic and Lewis basic sites

2015 ◽  
Vol 69 (4) ◽  
Author(s):  
Davood Habibi ◽  
Atefeh Shamsian ◽  
Davood Nematollahi
Keyword(s):  
Ionic Liquid ◽  
Ambient Temperature ◽  
Solvent Free ◽  
Reusable Catalyst ◽  
Product Yields ◽  
Basic Sites ◽  
Solvent Free Conditions ◽  
Brönsted Acid ◽  
Acidic Sites ◽  
Hydrogen Sulphate

AbstractAn efficient ionic liquid with both Brønsted acidic and Lewis basic sites, namely 1,4-dimethyl-1- (4-sulphobutyl)piperazinium hydrogen sulphate (IL1), was synthesised and characterised. IL1 is a “green”, homogeneous and reusable catalyst for: i) the synthesis of pyranopyrazoles (Va-Vj) and benzopyrans (VIa-VIj and VIIa-VIIf) at ambient temperature under solvent-free conditions and ii) the synthesis of amino-2-chromenes (VIIIa-VIIIi and IXa-IXi) and dihyropyrano[c]chromenes (Xa- Xi) at 80◦C under solvent-free conditions. The reactions were rapid with excellent product yields. In addition, the double Brønsted acid, 1,4-dimethyl-1,4-bis(4-sulphobutyl)piperazinium hydrogen sulphate (IL2), was prepared to evaluate the cooperation efficiency of their Brønsted acidic and Lewis basic sites as compared with the double Brønsted acidic sites in IL1

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