OOIR: Observatory of International Research

Papers

(The median citation count of Organic Preparations and Procedures International is 1. 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
Current Advances in Transition Metal-Free Access to Indoles. A Review	15
Synthesis and Antiproliferative Evaluation of Novel 5-Aryl Substituted Oxazolo[4,5-b]pyridin-2-amine Derivatives	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
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
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
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
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
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
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
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 3-Aryl-4-phenyl-1-selenoxo-1,4-dihydro-9-oxa-2,4-diaza-phenanthren-10-ones via a One-pot Reaction	1
Efficient Synthesis of Xanthenediones Using CuCeO₂ Nanoparticle Catalyst in Aqueous Medium	1
Visible Light Assisted Synthesis of Tetrahydrobenzo[ b ]pyrans Using 4CzIPN, a Carbazole-Based Photocatalyst	1
Facile Synthesis of Substituted Pyrroles Using Silica Supported Catalysis	1
Green Approach for Metal-free One-pot Synthesis of Tetrahydrobenzo[b]pyrans with Sodium Alginate as a Reusable Bifunctional Biopolymeric Catalyst	1
Alcoholysis of N -Substituted Amides and Carboxylic Acid Hydrazides in the Presence of Triflic Acid	1
Synthesis of Lithocholic Acid from Plant-sourced Bisnoralcohol	1
One-Pot Three-Component Synthesis of Novel 1-((4-Aminosulfonylphenyl)methyl)-5-aryl-4-benzoyl-3-hydroxy-3-pyrrolin-2-ones in Aqueous Media and Investigation of Their Antimicrobial Activity	1
Copper Phthalocyanine Tetrasulfonic Acid, a Recyclable Solid Acid Catalyst for the Synthesis of Aryl Iodides and Azides from Aryl Amines via Diazotization	1
Synthesis of Isoxazole-5(4 H )-ones Using Citrazinic Acid as an Organocatalyst in Aqueous Conditions	1
ZnCl₂ Catalyzed Ring-Opening Reaction of Symmetrical Epoxides with Aromatic Amines for the Synthesis of 1,2-Amino Alcohols	1
A Brief Review on the Synthesis of Pyrrolo[2,3-c]coumarins, including Lamellarin and Ningalin Scaffolds	1
Rapid Access to Pyrano[2,3-d]pyrimidines Using Microwave Assisted [EMIM][OH] Catalysis	1
Synthesis, Molecular Modeling, and Biological Evaluation of New N-(Benzo[d]thiazol-2-yl)-3-amino-but-2-enamide Derivatives as Cytotoxic Agents	1
Preparation and Biological Evaluation of Thymol Functionalized 2-Pyrazoline and Dihydropyrimidinone Hybrids	1
A Green, Facile, and Efficient Synthesis of 4H-Benzo[b]pyrans Using 2,2’-Bipyridine as a Recyclable Organocatalyst	1
Preparation of Novel Bisphenanthro[9,10-d]imidazoles with an Efficient Copper Nano Magnetic Catalyst	1
Magnetic Fe₃O₄@SiO₂ Core–Shell Nanoparticles Functionalized with Sulfamic Acid Polyamidoamine (PAMAM) Dendrimer for the Multicomponent Synthesis of Polyhydroquinolines	1
Microwave-Assisted OPC-VH Mediated Synthesis of 2-Amino-1,3,4-thiadiazoles	1
1,2-Diaryl-4,5-diphenyl-1 H -imidazoles: Further Preparative Studies Using Amberlite IR120(H) as a Recyclable Heterogeneous Catalyst	1
Synthesis of Novel β-Lactams via Substitution Reactions of Thiolaryl Substituted β-Lactam Precursors	1
Regioselective Benzylation of N-Boc-N’-COCF₃-protected Hydrazine	1
Novel Synthesis of Multifunctionalized Spiro[benzofurancyclobutanes] via Aqueous Three-component Reaction Catalyzed by Theophylline	1
Pyridinium Chlorochromate Supported on Montmorillonite–KSF as a Versatile Oxidant under Ball Milling Conditions	1
A Novel Process for the Key Intermediate of Fluoroquinolones	1
One-pot Synthesis of Tetrahydrobenzo[4,5]imidazo[2, 1-b]quinazolin-1(2H)-ones Usingβ-Cyclodextrin-SO₃H as a Biocompatible and Recoverable Catalyst in Water	1
Fe₃O₄@THAM-SO₃H as an Efficient Heterogeneous Magnetic Nanocatalyst to Access Functionalized Pyrrole and Polyhydroquinoline Derivatives	1
Synthesis of Novel Quinolines with Antibacterial Activity	1
Sulfated Starch: A Highly Efficient Catalyst for Transamidation of Primary and Secondary Amines with Formamide and Acetamide	1
An Efficient One-Pot Synthesis of 2-Aryl-4,5-diphenyl-1H-imidazoles with Amberlite IR-120(H) as a Reusable Heterogeneous Catalyst	1
Facile Synthesis of Novel Cylopenta[ b ]indoles and Their Biological Assessments	1
A Greener Synthesis of N-( p -Toluenesulfonyl)imidazole Using the Bio-Renewable Solvent 2-MeTHF, Companion DFT Studies	1
An Efficient Regioselective Preparation of Fulvestrant	1
Three-component Domino Reaction in Aqueous Media for the Synthesis of New Indeno[1,2- b ]pyrroles and Pyrrole-fused Isocoumarins and a Study of Their Antibacterial Prope	1
Cu(NO ₃ ) ₂ /HNO ₃ Oxidation of Chloromethyl-aryl-himachalene: Synthesis of a Novel Aldehyde De	1
A Tris-Aldehyde Porphyrin Synthon: Synthesis and Characterization of 5,10,15-tris-(4’-(4-Formylphenoxy) propoxyphenyl)-20-(4-nitrophenyl)-porphyrin	1
An Efficient Synthesis of Curcumin Pyrazole Analogues and their Biological Activities	1
Synthesis, Insecticidal Activity and DFT Study of 1,2,4-Triazolidinthione, 1,3,5-Oxadiazine and Thiourea Derivatives	1
Expeditious and Highly Efficient One-Pot Synthesis of Functionalized Imidazoles Catalyzed by Sulfated Polyborate	1
An Alternative Greener Synthesis of Dibenzalacetone	1
Synthesis of Substituted N- (4 H -1,2,4-Triazol-4-yl)benzamides as Potential Antifungal Agents	1
Emerging Approaches for Synthesis of 1,2,3-Triazole Derivatives. A Review	1
Synthesis of Pharma Europa Impurity-A of Flecainide Acetate	1
Tetrabutylammonium Iodide/I₂ Mediated Convenient and Green Synthesis of Substituted Organic Isothiocyanates	1
Fe₃O₄@garlic peel-OSO₃H: Preparation, Characterization and Application as an Effective and Novel Nanocatalyst for One-Pot Synthesis of 2-Amino-3-phenylsulfonyl-4-aryl-	1
An Efficient Solvent-free Synthesis of Spiro-substituted Cyclopropanes by Grinding	1
A New One-pot Synthesis of 4-Arylideneisoxazolones Catalyzed by Na ₂ SO ₃ in an Aqueous Medium	1
Synthesis of Novel Amide Derivatives of the Sesquiterpene Aryl-himachalene	1
Green Pathway for Solvent-free Synthesis of Tetrahydrobenzo[ b ]pyrans Promoted by Carboxymethyl Cellulose (CMC) as a Recyclable and Biodegradable Catalyst	1
Aluminized Polyborate: A New and Eco-friendly Catalyst for the Synthesis of SymmetricalN,N’-Di(aryl/alkyl)formamidines	1