OOIR: Observatory of International Research

Papers

(The TQCC of Organic Preparations and Procedures International is 3. The table below lists those papers that are above that threshold based on CrossRef citation counts [max. 250 papers]. The publications cover those that have been published in the past four years, i.e., from 2020-05-01 to 2024-05-01.)

Article	Citations
Greener Synthesis of 3,4-Disubstituted Isoxazole-5(4H)-ones in a Deep Eutectic Solvent	24
Dendrimer-Functionalized Magnetic Graphene Oxide for Knoevenagel Condensation	19
Nanostructural Cu-Doped ZnO Hollow Spheres as an Economical and Recyclable Catalyst in the Synthesis of 1H-pyrazolo[1,2-b]phthalazine-5,10-diones and Pyrazolo[1,2-a][1,2,4]triazol	19
Ring Opening Reactions of Epoxides. A Review	17
Magnetic Fe₃O₄@SiO₂ Core–Shell Nanoparticles Functionalized with Sulfamic Acid Polyamidoamine (PAMAM) Dendrimer for the Multicomponent Synthesis of Polyhydroquinolines	17
A Concise and Efficient Synthesis of Novel Alkylated 2-(2-hydroxyphenyl)-4,5-diphenylimidazole-based Ionic Liquids Using the MAOS Technique	15
Sulfated Polyborate Catalyzed Selective Friedlander Annulation for Synthesis of Highly Functionalized Quinolines	14
Facile Protocol for the Synthesis of 2-Amino-4H-Chromene Derivatives using Choline Chloride/Urea	14
Green Synthesis of Copper Oxide Nanoparticles with an Extract of Euphorbia maculata and Their Use in the Biginelli Reaction	14
Eco-friendly Preparations of Heterocycles Using Fruit Juices as Catalysts: A Review	12
Glycine as a Green Catalyst for the Preparation of Xanthenes	12
Design of 2-Carboxy-1-sulfopyridin-1-ium Chloride as an Efficient and Eco-friendly Catalyst for the One-pot Synthesis of Highly Functionalized Tetrahydropyridines	12
Three-Component Synthesis of 1,4-Disubstituted 1,2,3-Triazoles using a Novel and Efficient Nano Alumina Based Cu(II) Catalyst	10
Catalyst-free Synthesis of Pyrano[2,3-d]pyrimidine Scaffolds via Knoevenagel-Michael Cyclocondensation Using PEG-400 as a Green Promoting Medium	9
Expeditious and Highly Efficient One-Pot Synthesis of Functionalized Imidazoles Catalyzed by Sulfated Polyborate	9
Caffeine as a Naturally Green and Biodegradable Catalyst for Preparation of Dihydropyrano[2,3-c]pyrazoles	9
Green Methods for the Synthesis of Pyrazoles: A Review	8
A New Multicomponent Reaction for the Synthesis of Amides	8
Synthesis and Antibacterial Activity of Novel 1,3-Oxazine Derivatives	8
A Highly Effectual and Rapid Protocol for the Synthesis of 5-Amino-1,3-diaryl-1H-pyrazole-4-carbonitriles Using 1,3-Disulfonic Acid Imidazolium Trifluoroacetate as a Dual-Functional Catalyst	8
Friedländer Synthesis of Novel Polycyclic Quinolines Using Solid SiO₂/H₂SO₄ Catalyst	8
An Efficient Synthesis of Substituted Imidazoles Catalyzed by 3-N-Morpholinopropanesulfonic Acid (MOPS) under Ultrasound Irradiation	8
Biowaste-Derived Heterogeneous Catalyst for the One-Pot Multicomponent Synthesis of Diverse and Densely Functionalized 2-Amino-4H-Chromenes	8
Synthesis of 3-Substituted Indoles Using Deep Eutectic Solvent and Ultrasound	8
Silica Sulfuric Acid/Ethylene Glycol: An Efficient Eco-Friendly Catalyst for One-Pot Synthesis of New Benzo[4,5]imidazo[1,2-a]pyrimidines	7

Solvent- and Catalyst-Free Synthesis of 6H-Chromeno [4,3-b]quinolin-6-ones	7
Recent Trends in the Chemistry of [1,2,4]Triazole[1,5-a]pyrimidines	7
Ultrasound Promoted Green Synthesis of Spiro Indoline-3,4′-pyrano[2,3-c]pyrazoles	7
Ultrasound-Promoted One-Pot Three-Component Synthesis of β–Amino Carbonyl Compounds Using Manganese Perchlorate	7
Green Approach for Metal-free One-pot Synthesis of Tetrahydrobenzo[b]pyrans with Sodium Alginate as a Reusable Bifunctional Biopolymeric Catalyst	7
Application of [PVP-SO₃H] HSO₄ as an Efficient Polymeric-Based Solid Acid Catalyst in the Synthesis of Some Benzimidazole Derivatives	7
Preparation of Novel Chiral α-Diazocarbonyl Compounds Using Regitz’s Methodology	7
Solvent-free, Efficient Transamidation of Carboxamides with Amines Catalyzed by Recyclable Sulfated Polyborate Catalyst	6
A Brief Review on the Synthesis of Pyrrolo[2,3-c]coumarins, including Lamellarin and Ningalin Scaffolds	6
Soluble Glass, an Efficient Promoter for the Cascade Addition-Cyclization Reaction of 4-Hydroxycoumarins to Chalcone Derivatives	6
One-pot Synthesis of Pyranoquinoline Derivatives Using a New Nanomagnetic Catalyst Supported on Functionalized 4-Aminopyridine (AP) Silica	6
A New Approach to the Total Synthesis of 20-Deethyltubifolidine and an Entry to the Azocino[4,3-b]indoles	6
Solvent-free Synthesis of Halogenated Furo[2,3-d] pyrimidines and Their Cytotoxic Activity on the T47D Breast Cancer Cell Line	6
Solvent-free Synthesis of Pyrano[2,3-d]pyrimidine Scaffolds Using per-6-NH₂-β-CD as a Reusable Supramolecular Host	6
Emerging Approaches for Synthesis of 1,2,3-Triazole Derivatives. A Review	6
An Efficient Synthesis of Novel Imidazo-Aminopyridinyl Derivatives from 2-Chloro-4-cyanopyridine	6
Ionic-liquid Promoted Multi-component Preparation of Pyrazolo[3,4-d]thiazolo[3,2-a]pyrimidines under Solvent-free Conditions	5
Synthesis of Pyran Annulated Heterocyclic Compounds under Catalyst Free Conditions Using Aqueous Ethylene Glycol	5
Synthesis of Isoxazole-5(4 H )-ones Using Citrazinic Acid as an Organocatalyst in Aqueous Conditions	5
Chemoselective Benzylic Oxidation of Alkyl-Substituted Aromatics to Ketones with trans-3,5-Dihydroperoxy-3,5 Dimethyl-1,2-Dioxolane	5
Synthetic Applications of a New Magnetic Mesoporous Nanocomposite Catalyst Fe₃O₄@MCM-41@NH-SO₃H	5
BTMA-Br₃ Promoted One Pot Synthesis of 1, 8-Dioxo-octahydroxanthenes under Eco-friendly Conditions	5
Natural Deep Eutectic Solvent as a Green Catalyst for the One-pot Synthesis of Chromene and 4H-Pyran Derivatives	5
Curcumin-Derived Heterocycles as Anticancer Agents. A Systematic Review.	5
One-Pot Expeditious Synthesis of 2-Amino-4,6-(disubstituted)nicotinonitriles Using Activated Fuller’s Earth as Catalyst	5
Current Advances in Transition Metal-Free Access to Indoles. A Review	5
Synthesis of Triazolothiones Using Nano-Fe₃O₄@SiO₂-SO₃H as a Heterogeneous Catalyst	4
Solar Energy Mediated Green Synthesis of Tetrahydrobenzo[b]pyrans Using L-Ascorbic Acid as an Organocatalyst in Aqueous Medium	4
Ultrasound-Assisted Heterogeneous Oxidation of 1,4-Dihydropyridines	4
An Improved Approach to the Synthesis of (±)-Noruleine	4
Synthesis and Characterization of New Chalcone Derivatives of Aryl-Himachalene	4
Tetrabutylammonium Iodide/I₂ Mediated Convenient and Green Synthesis of Substituted Organic Isothiocyanates	4
Preparation and Biological Activities of Novel Cuminaldehyde Derivatives	4
Synthesis of Dihydropyrano[2,3-C]pyrazoles Using Mandelic Acid as an Efficient Catalyst	3
One-pot Synthesis of Benzimidazoles Using H₂SO₄@HTC as Catalyst	3
DABCO-catalyzed Five-component Domino Protocol for the Synthesis of Novel Benzo[a]pyrazolo[4’,3’:5,6]pyrano[2,3-c]phenazines in PEG-400 as an Efficient Green Reaction Medium	3
Recent Synthetic Applications of Hypervalent Iodine Reagents. A Review in Three Installments: Installment I	3
Choline Chloride-based Eutectic Mixtures for Greener Synthesis of Quinoxaline-2,3-diol Derivatives and Terephthalaldehyde bis-(2-Aminophenylimine)	3
Preparation of Thiazolidin-4-ones Using NiFe₂O₄@SiO₂ Grafted Propylsulfonic Acid as an Efficient Catalyst	3
An Improved Synthesis of Memantine Hydrochloride	3
An Improved Synthesis of Polyfunctional Acyl Azides in PEG 400	3
Eco-Friendly and Efficient Greener Process for the Synthesis of Chalcones and Pyrazolones Using the Supramolecular Catalyst β-Cyclodextrin	3
The Use of MnCoFe₂O₄@GT@Cu Magnetic Nanoparticles in the Synthesis of Benzopyrans	3
Efficient Synthesis of Xanthenediones Using CuCeO₂ Nanoparticle Catalyst in Aqueous Medium	3
An Efficient Regioselective Preparation of Fulvestrant	3
An Efficient One-Pot Synthesis of 2-Aryl-4,5-diphenyl-1H-imidazoles with Amberlite IR-120(H) as a Reusable Heterogeneous Catalyst	3
Development of 7-Aminopyrazolo[1,5-a]pyrimidines as Anti-Candida and Antibacterial Agents	3
A New, Highly Efficient and Green Protocol for the Synthesis of Pyranochromenes	3
Catalytic Application of 1,4-Piperazinediethanesulfonic Acid (PIPES) for the One-pot Multicomponent Synthesis of Pyrano[4,3-b]pyrans	3
Nano-[Fe₃O₄@SiO₂-R-NHMe₂][H₂PO₄] as a Highly Effectual and Magnetically Recyclable Catalyst for the Preparation of bis(6-Amino-1,3-dim	3

Aluminized Polyborate: A New and Eco-friendly Catalyst for One-pot Multicomponent Synthesis of 1,3-Diaryl-3-(arylamino)propan-1-ones via Mannich Reaction	3
One-pot Preparation of Novel 1,4-Dihydropyridines in the Presence of SBA-15-SO₃H	3
Cu(II)/Triazine-Based Dendrimer as an Efficacious Recoverable Nano-catalyst for the Preparation of 1-Substituted-1H-1,2,3,4-Tetrazoles under Solventless Conditions	3
Aluminized Polyborate: A New and Eco-friendly Catalyst for the Synthesis of SymmetricalN,N’-Di(aryl/alkyl)formamidines	3