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 2021-06-01 to 2025-06-01.)

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	46
One Pot Unexpected Isocyanide-based Three-component Synthesis of Pyrrole-3-carboxamides Containing Ether Groups	22
Synthesis and Antiproliferative Evaluation of Novel 5-Substituted Pyridazin-4-Amine Derivatives	20
Synthesis of 2,3-Dihydroquinazolinones via Condensation of 2-Aminobenzamides with Aldehydes under Ball Milling Conditions	19
H ₆ P ₂ W ₁₈ O ₆₂ ·18H ₂	16
Synthesis and Antiproliferative Evaluation of Novel 5-Aryl Substituted Oxazolo[4,5-b]pyridin-2-amine Derivatives	15
Current Advances in Transition Metal-Free Access to Indoles. A Review	15
Facile Synthesis of Spirocyclic Oxindole Scaffolds via Intermolecular [4 + 1] Cycloaddition of ortho -Quinone Methides with 3-Chlorooxindoles	14
Microwave-Assisted Iodotrimethylsilane-Promoted Synthesis of Novel Pyrazolyl Chalcones	14
An Improved and Practical Synthesis of Vonoprazan	12
Catalytic Evaluation of Surface Engineered Activated Carbon with SnO ₂ Nanoparticles for Synthesis of Dihydropyrimidinones at Room Temperature	12
An Improved Method for Alcoholysis of Amides and Acid Hydrazides by Secondary Alcohols in the Presence of Triflic Acid	11
Rapid Synthesis of 3-Hydroxyflavones from 2’-Hydroxyacetophenones and Benzaldehydes	10
Design and One-pot Synthesis of Novel Carbazole-based Thiazolone Imines	10
Eco-Friendly and Efficient Greener Process for the Synthesis of Chalcones and Pyrazolones Using the Supramolecular Catalyst β-Cyclodextrin	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
New Approach for the Synthesis and Purification of Spiro[fluorene-9,5’-[1,3]-dioxan]-2’-one	9
Development of an Efficient Alternative Synthesis of the Endothelin Receptor Antagonist Bosentan	8
An Organocatalytic Biogenic Approach for the Synthesis of Coumarins Using the Pechmann Condensation Reaction	8
Efficient Synthesis of trans-3-Amino-1-methylcyclobutan-1-ol	7
Manganese (II) Chloride Tetrahydrate as an Efficient Catalyst for the Preparation of 5-Aryl-1 H -tetrazoles via [3 + 2] Cycloaddition of S	7
Synthesis of Novel 1,4-Disubstituted Piperazines and Evaluation of Their Antibacterial Activities	7
Novel Synthetic Access to 24a-Homochol-5-en-24a-oate Scaffold from Stigmasterol	7
Reinvestigating the Preparation of Glyoxime and Its Chlorination by a Slight Overpressure of Chlorine Gas to Prepare Dichloroglyoxime	6
An Original Transposition of the 4-Fluorobenzylamino Group from 1-(4-Fluorobenzylamino)-1-methylsulfanyl-2-nitroethylene in Triflic Acid^†	6

Synthesis of Novel Substituted Guanidines and Pyrimidines Using Pyridinium and Methanaminium Salts in Water as a Green Solvent	6
A Novel and Rapid Method to Prepare Aminothiazoles	5
A Simple, General Method for the Synthesis of 1-Chloro-3-(1,2,3-triazol-1-yl)-propan-2-ol Derivatives and Computational Analysis Thereof	5
Synthesis of 5-Methoxy-2-acetyl-1-naphthol	5
Preparation of Thiazolidin-4-ones Using NiFe₂O₄@SiO₂ Grafted Propylsulfonic Acid as an Efficient Catalyst	5
An Efficient and Practical Synthesis of Oseltamivir Phosphate	5
A Rapid and Environmentally Benign Access to Hantzsch’s Polyhydroquinolines	5
Synthesis of Tetrahydrobenzo[b]pyrans Promoted by Sodium Stearate as a Lewis Base-Surfactant Combined Catalyst in an Aqueous Micellar Medium	5
Recent Advances in 2-Aminobenzothiazole Chemistry: Catalysis in the Preparation of 1-(Benzothiazolylamino)methyl-2-naphthols. A Brief Review	5
Contemporary Developments in the Transition-Metal Catalyzed Synthesis of Indoles. A Review	4
Comparison of the Accelerating Effects of Two Ionic Liquids in the Oxidation of Alcohols	4
Melamine, a Recyclable Catalyst for the Synthesis of Dihydropyrano[2,3-c]pyrazoles in Aqueous Ethanol	4
A Novel Green Approach to the Synthesis of bis-4-Hydroxycoumarins	4
Highly Stereoselective and Scalable Synthesis of Eldecalcitol	4
Preparation and Biological Activities of Novel Tetra-arylidene Barbituric Acids Containing Ether Spacers	4
Green Methods for the Synthesis of Pyrazoles: A Review	4
One-pot Three-component Synthesis of Novel 1,3,4-Thiadiazole-thiazolo[3,2-a]pyrimidine Derivatives Catalyzed by Molecular Iodine	4
Preparation of 2,3-Diarylthiazolidin-4-one Derivatives Using Barium Sulfate Nano-Powders	4
Carboxymethyl Cellulose (CMC) as a Recyclable and Biodegradable Catalyst: A Greener Solvent-free Preparation of Pyrano[2,3- d ]pyrimidines	3
CAN Combined with NaI as Promoter System for the Synthesis of Novel Ethyl 1,2-Diarylpyrrolidine-3-carboxylate Derivatives via Three-Component Reaction	3
Solvent-free Acetylation Procedure	3
Synthesis of “Tablets Impurity” and “Impurity B” of Vigabatrin, an Antiepileptic Drug	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
Solar Energy Mediated Green Synthesis of Tetrahydrobenzo[b]pyrans Using L-Ascorbic Acid as an Organocatalyst in Aqueous Medium	3
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	3
An Improved Procedure for the Synthesis of Amantadine Hydrochloride	3
Selective One-pot Synthesis of 2-Aryl-1-arylmethyl-1H-1,3-benzimidazoles in the Presence of Ammonium Persulfate and Their Antioxidant Activity	3
Gram Scale Synthesis of Honokiol	3
SbPh ₃ : An Efficient Catalyst for Dihydropyrimidinone and Dihydropyrimidin-5-carboxamide Synthesis Using the Biginelli Reaction	3
Synthesis of Dihydropyrano[2,3- c ]pyrazoles with Trifluoroethanol as a Reusable Promoting Medium: A Green Protocol	3
Recent Synthetic Applications of Hypervalent Iodine Reagents. A Review in Three Installments: Installment I	3
An Efficient Synthesis Process for 3,4-Dichloronitrobenzene Using the Solid Acid Catalyst SZT-0.15	3
One Pot Synthesis of Deterenol, a Sympathomimetic Ingredient of the Dietary Supplement Dexaprine	3
Ring Opening Reactions of Epoxides. A Review	3
Multi-gram Preparation of 1-(3-Dimethylamino propyl)-3-ethylurea (EDU)	2
Design, Synthesis, Anticancer Evaluation and Molecular Docking Studies of Amide Derivatives of 1,3,4-Thiadiazolyl Pyridinyl Isoxazoles	2
Synthesis of Novel bis(1,2-Dihydro-4-hydroxy-2-oxoquinolin-3-yl)methanes using DSDABCOC as an Effective Medium	2
A Mild Synthetic Method for Selective Conversion of Camphene to Isoborneol Derivatives	2
Synthesis of Novel 1,2,4-Triazole Derivatives of N-Benzyl-5-nitroisatin: Anticancer Activity, Anti-oxidant Activity, and Molecular Design	2
Fluorophosphoric Acid Promoted Formation of Imines of Sulfonamides and Dihydropyridines at Room Temperature	2
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	2
New and Convergent Synthesis of Deucravacitinib	2
Recent Developments in Enantioselective Silver-Catalyzed Transformations	2
Tartaric Acid as an Expeditious and Green Catalyst for the Synthesis of 1,2,4-Triazolidine-3-thiones in an Aqueous Medium	2
An Efficient Synthesis of Novel 7-Aryl-1 H -[1,2,4]triazolo[1,5- a ][1,3,5]triazine-5-selones from Aroyl Chlorides, Potassium Selenocyanat	2
Guanidine Hydrochloride Catalyzed Efficient and Expeditious One-Pot Synthesis of 2, 4, 5-Triaryl Imidazole Derivatives	2
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	2
A Practical Green Synthesis of ( R )-5,7-difluorochroman-4-ol, a Key Intermediate of Tegoprazan	2
Synthesis of Dihydropyrano[2,3-C]pyrazoles Using Mandelic Acid as an Efficient Catalyst	2
Application of Fe₃O₄@SiO₂-Propyl@dapsone-copper Complex Nanoparticles as a Magnetically Recoverable Catalyst for the Synthesis of Azo-linked andbis-Benzo[d]imid	2

Curd Water as a Catalytic Solvent for the Preparation of bis -Coumarins	2
Development of a Novel and Scalable Process for the Synthesis of a Key Nafithromycin Intermediate	2
Natural Deep Eutectic Solvent as a Green Catalyst for the One-pot Synthesis of Chromene and 4H-Pyran Derivatives	2
A Concise Account of Synthetic Approaches to 1,2,3-Triazoles	2
Three-Component Synthesis of 1,4-Disubstituted 1,2,3-Triazoles using a Novel and Efficient Nano Alumina Based Cu(II) Catalyst	2
Synthesis of Chromenes Using CuO/ZnO@N-GQDs@NH₂ Nanocomposite as a High Performance Catalyst	2
Facile Preparation of 3,6-Dimethoxy-2-nitrobenzaldehyde	2
The Synthesis of gem-Bisamides Using a Carbocationic Catalytic System in Neutral Media	2
Functionalized Pyrimidines: Synthetic Approaches and Biological Activities. A Review	2