OOIR: Observatory of International Research

Papers

(The TQCC of Organic Preparations and Procedures International is 2. 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 2022-08-01 to 2026-08-01.)

Article	Citations
Copper (II)-immobilized on Starch-coated Nanomagnetite as an Efficient and Magnetically Recoverable Catalyst for the Synthesis of Propargylamines through One-pot A³ Coupling Reaction	38
H ₆ P ₂ W ₁₈ O ₆₂ ·18H ₂	21
Current Advances in Transition Metal-Free Access to Indoles. A Review	20
Synthesis of 2,3-Dihydroquinazolinones via Condensation of 2-Aminobenzamides with Aldehydes under Ball Milling Conditions	14
Facile Synthesis of Spirocyclic Oxindole Scaffolds via Intermolecular [4 + 1] Cycloaddition of ortho -Quinone Methides with 3-Chlorooxindoles	13
An Improved and Practical Synthesis of Vonoprazan	13
Microwave-Assisted Iodotrimethylsilane-Promoted Synthesis of Novel Pyrazolyl Chalcones	12
Catalytic Evaluation of Surface Engineered Activated Carbon with SnO ₂ Nanoparticles for Synthesis of Dihydropyrimidinones at Room Temperature	12
Design, Synthesis, and Insecticidal Activity of Novel Fipronil Derivatives Incorporating a Sulfide Unit	10
New Approach for the Synthesis and Purification of Spiro[fluorene-9,5’-[1,3]-dioxan]-2’-one	9
An Improved Method for Alcoholysis of Amides and Acid Hydrazides by Secondary Alcohols in the Presence of Triflic Acid	9
Magnetic Nanoparticle Supported Lewis Acidic Deep Eutectic Solvent (LADES@MNP) for the One-pot Synthesis of 14-Aryl-14- H -dibenzo[a,j]xanthenes	9
Development of an Efficient Alternative Synthesis of the Endothelin Receptor Antagonist Bosentan	8
New and Practical Synthesis of N -(Pyrimidin-5-ylmethyl)pyridin-2-amine, the Key Intermediate to Triflumezopyrim	8
New Coumarin Derivatives as Cytotoxic Agents: Synthesis, in silico DNA-Binding Studies and MTT Assays in the MCF-7 Cell Line	8
Design and One-pot Synthesis of Novel Carbazole-based Thiazolone Imines	8
Rapid Synthesis of 3-Hydroxyflavones from 2’-Hydroxyacetophenones and Benzaldehydes	8
An Original Transposition of the 4-Fluorobenzylamino Group from 1-(4-Fluorobenzylamino)-1-methylsulfanyl-2-nitroethylene in Triflic Acid^†	7
Efficient Synthesis of trans-3-Amino-1-methylcyclobutan-1-ol	7
Reinvestigating the Preparation of Glyoxime and Its Chlorination by a Slight Overpressure of Chlorine Gas to Prepare Dichloroglyoxime	7
Synthesis of Novel 1,4-Disubstituted Piperazines and Evaluation of Their Antibacterial Activities	6
An Organocatalytic Biogenic Approach for the Synthesis of Coumarins Using the Pechmann Condensation Reaction	6
Manganese (II) Chloride Tetrahydrate as an Efficient Catalyst for the Preparation of 5-Aryl-1 H -tetrazoles via	6
Synthesis of Novel Substituted Guanidines and Pyrimidines Using Pyridinium and Methanaminium Salts in Water as a Green Solvent	6
An Efficient and Practical Synthesis of Oseltamivir Phosphate	6

Synthesis of 5-Methoxy-2-acetyl-1-naphthol	6
Sustainable Synthesis of Chalcones via Curd Bio-catalysis: A Greener Approach to the Synthesis of Chalcones with Curd	5
Synthesis of Tetrahydrobenzo[b]pyrans Promoted by Sodium Stearate as a Lewis Base-Surfactant Combined Catalyst in an Aqueous Micellar Medium	5
Contemporary Developments in the Transition-Metal Catalyzed Synthesis of Indoles. A Review	5
Synthesis of Dihydropyrano[2,3- c ]pyrazoles with Trifluoroethanol as a Reusable Promoting Medium: A Green Protocol	5
Recent Advances in 2-Aminobenzothiazole Chemistry: Catalysis in the Preparation of 1-(Benzothiazolylamino)methyl-2-naphthols. A Brief Review	5
A Rapid and Environmentally Benign Access to Hantzsch’s Polyhydroquinolines	5
Melamine, a Recyclable Catalyst for the Synthesis of Dihydropyrano[2,3-c]pyrazoles in Aqueous Ethanol	5
A Novel and Rapid Method to Prepare Aminothiazoles	5
Eco-Friendly Access to 2,4,5-Trisubstituted Imidazoles using (Cu ₂ O)Cu@C-NPs as a Nanoparticulate Heterogeneous Catalyst	5
Ultrasonic Assisted Mono-iodination of Activated Aromatics Using Iodine and Iodic Acid	5
Highly Stereoselective and Scalable Synthesis of Eldecalcitol	5
CAN Combined with NaI as Promoter System for the Synthesis of Novel Ethyl 1,2-Diarylpyrrolidine-3-carboxylate Derivatives via Three-Component Reaction	4
Oxidative Cleavage of C=N Bond of Ketoximes with Singlet Molecular Oxygen Generated from trans- 5-Hydroperoxy-3,5-dimethyl-1,2-dioxolane-3-yl Ethaneperoxoate	4
First Report of [Bmim][OAc]-Catalyzed Synthesis of Tetrahydro-4H-Chromenes under Grinding and Aqueous Conditions, with Antibacterial Evaluation of the Products	4
Comparison of the Accelerating Effects of Two Ionic Liquids in the Oxidation of Alcohols	4
Carboxymethyl Cellulose (CMC) as a Recyclable and Biodegradable Catalyst: A Greener Solvent-free Preparation of Pyrano[2,3- d ]pyrimidines	4
One-Pot Synthesis of 1H-Pyrazolo[1, 2- b]phthalazine-5, 10-diones by an Effective In ₂ O ₃ -SiO	4
Eco-friendly Oxidative Cleavage of the C=N Bond to Transform Oximes into Carbonyl Compounds using an Aqueous Saponin Extract of Quillaja Bark	4
Recent Synthetic Applications of Hypervalent Iodine Reagents. A Review in Three Installments: Installment I	4
Total Synthesis of Calothrixin B and a Novel Brominated Analog via C-H Activation and Heck Coupling	4
Synthesis of “Tablets Impurity” and “Impurity B” of Vigabatrin, an Antiepileptic Drug	4
An Efficient Synthesis Process for 3,4-Dichloronitrobenzene Using the Solid Acid Catalyst SZT-0.15	4
Synthesis, Characterization, Photophysical, and Computational Studies of Novel Iminocoumarin Derivatives	3
An Efficient Strategy for the Synthesis of Fused-Ring Tetrahydro[b]pyrans Using P ₂ O ₅ /SiO	3
Fluorophosphoric Acid Promoted Formation of Imines of Sulfonamides and Dihydropyridines at Room Temperature	3
Functionalized Pyrimidines: Synthetic Approaches and Biological Activities. A Review	3
Greener Synthesis of Novel Azo-linked 1,2,4-Triazolidine-3-ones (thiones) Using Recyclable Fe ₃ O ₄ @SP@vanillin@thioglycolic Acid	3
New and Convergent Synthesis of Deucravacitinib	3
A Recyclable Halide Perovskite Photocatalyst as a Single-electron Redox Mediator: Radical-initiated Gram-scale Photosynthesis of Pyrano[2,3 -d ]pyrimidines Induced by Vi	3
A Practical Green Synthesis of ( R )-5,7-difluorochroman-4-ol, a Key Intermediate of Tegoprazan	3
SbPh ₃ : An Efficient Catalyst for Dihydropyrimidinone and Dihydropyrimidin-5-carboxamide Synthesis Using the Biginelli Reaction	3
Ammonium Acetate as an Efficient and Greener Catalyst for the Synthesis of 1 H -Pyrazolo[1,2- b ]phthalazine-5,10-diones in an Aqueous Med	3
Lithium Bromide: An Efficient Catalyst for the Environmentally-friendly Synthesis of Pyrano[2,3- d ]pyrimidines in an Aqueous Medium	3
Mild Synthesis of Novel Azo-linked 4-Arylquinazoline-2,5( 3H , 6H )-diones and Azo-linked 4-Aryl-2-thioxoq	2
Synthesis of 3,4-Dihydropyrimidin-2-(1 H )-ones/thiones Catalyzed by Cetyltrimethylammonium Bromide (CTAB) in Aqueous Micellar Media: An Environmentally	2
Curd Water as a Catalytic Solvent for the Preparation of bis -Coumarins	2
Green Pathway for Solvent-free Synthesis of Tetrahydrobenzo[ b ]pyrans Promoted by Carboxymethyl Cellulose (CMC) as a Recyclable and Biodegradable Catalyst	2
A Green, Facile, and Efficient Synthesis of 4H-Benzo[b]pyrans Using 2,2’-Bipyridine as a Recyclable Organocatalyst	2
Eggshell/Kaolin Calcined System: An Efficient, Green, and Recoverable Catalyst for the One-Pot Biginelli Reaction	2
Synthesis of 2-Amino-4-aryl Thiazoles using Cu-NP/C Heterogeneous Catalyst	2
Natural Deep Eutectic Solvent as a Green Catalyst for the One-pot Synthesis of Chromene and 4H-Pyran Derivatives	2
Design, Synthesis, and Evaluation of Novel 2-(4-Benzylideneamino)phenoxy)acetamides as Antibacterial Agents	2
Metal-free Synthesis of 2-Amino-4 H -chromene Scaffolds Using N,N-Diisopropylethylamine as an Organobase Catalyst	2
Acylation of N-Boc-N’-COCF ₃ Protected Hydrazine	2
Synthesis of Novel 1,2,4-Triazole Derivatives of N-Benzyl-5-nitroisatin: Anticancer Activity, Anti-oxidant Activity, and Molecular Design	2
Recent Developments in Enantioselective Silver-Catalyzed Transformations	2
Guanidine Hydrochloride Catalyzed Efficient and Expeditious One-Pot Synthesis of 2, 4, 5-Triaryl Imidazole Derivatives	2
Synthesis of N-Benzoyl-4-O-(1H-Tetrazol-5-yl)-L-Tyrosine Ethyl Ester: A Functionalized Tyrosine Derivative	2
Multi-gram Preparation of 1-(3-Dimethylamino propyl)-3-ethylurea (EDU)	2

A Mild Synthetic Method for Selective Conversion of Camphene to Isoborneol Derivatives	2
Synthesis, Characterization, and Applications of Novel Pd-coated Magnetic Nano-particles. Identification of a Highly Effective Heterogeneous Catalyst for Tandem Ullmann Cross-coupling/Reductive-cycliz	2
Facile Preparation of 3,6-Dimethoxy-2-nitrobenzaldehyde	2
Synthesis and Chemical Reactions of 4-Aryl/heteroaryl Azo-3,5-diaminopyrazoles. A Brief Review	2
An Alternate Feasible Route for the Synthesis of 4-Aminocoumarin	2
A Greener Synthesis of N-( p -Toluenesulfonyl)imidazole Using the Bio-Renewable Solvent 2-MeTHF, Companion DFT Studies	2
Development of a Novel and Scalable Process for the Synthesis of a Key Nafithromycin Intermediate	2
Design, Synthesis, Anticancer Evaluation and Molecular Docking Studies of Amide Derivatives of 1,3,4-Thiadiazolyl Pyridinyl Isoxazoles	2
A Concise Account of Synthetic Approaches to 1,2,3-Triazoles	2
Improved and Scalable Single-Pot Process for Selexipag and Its Key Intermediate	2