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 2021-11-01 to 2025-11-01.)

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	52
Synthesis of 2,3-Dihydroquinazolinones via Condensation of 2-Aminobenzamides with Aldehydes under Ball Milling Conditions	25
H ₆ P ₂ W ₁₈ O ₆₂ ·18H ₂	24
Synthesis and Antiproliferative Evaluation of Novel 5-Substituted Pyridazin-4-Amine Derivatives	19
Current Advances in Transition Metal-Free Access to Indoles. A Review	18
Facile Synthesis of Spirocyclic Oxindole Scaffolds via Intermolecular [4 + 1] Cycloaddition of ortho -Quinone Methides with 3-Chlorooxindoles	16
An Improved Method for Alcoholysis of Amides and Acid Hydrazides by Secondary Alcohols in the Presence of Triflic Acid	13
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	11
Design, Synthesis, and Insecticidal Activity of Novel Fipronil Derivatives Incorporating a Sulfide Unit	10
Microwave-Assisted Iodotrimethylsilane-Promoted Synthesis of Novel Pyrazolyl Chalcones	9
New Approach for the Synthesis and Purification of Spiro[fluorene-9,5’-[1,3]-dioxan]-2’-one	8
Magnetic Nanoparticle Supported Lewis Acidic Deep Eutectic Solvent (LADES@MNP) for the One-pot Synthesis of 14-Aryl-14- H -dibenzo[a,j]xanthenes	8
Rapid Synthesis of 3-Hydroxyflavones from 2’-Hydroxyacetophenones and Benzaldehydes	8
Design and One-pot Synthesis of Novel Carbazole-based Thiazolone Imines	8
Eco-Friendly and Efficient Greener Process for the Synthesis of Chalcones and Pyrazolones Using the Supramolecular Catalyst β-Cyclodextrin	8
An Organocatalytic Biogenic Approach for the Synthesis of Coumarins Using the Pechmann Condensation Reaction	7
Development of an Efficient Alternative Synthesis of the Endothelin Receptor Antagonist Bosentan	7
Synthesis of Novel Substituted Guanidines and Pyrimidines Using Pyridinium and Methanaminium Salts in Water as a Green Solvent	7
Ultrasonic Assisted Mono-iodination of Activated Aromatics Using Iodine and Iodic Acid	6
Reinvestigating the Preparation of Glyoxime and Its Chlorination by a Slight Overpressure of Chlorine Gas to Prepare Dichloroglyoxime	6
Efficient Synthesis of trans-3-Amino-1-methylcyclobutan-1-ol	6
An Original Transposition of the 4-Fluorobenzylamino Group from 1-(4-Fluorobenzylamino)-1-methylsulfanyl-2-nitroethylene in Triflic Acid^†	6
A Rapid and Environmentally Benign Access to Hantzsch’s Polyhydroquinolines	5
Preparation of Thiazolidin-4-ones Using NiFe₂O₄@SiO₂ Grafted Propylsulfonic Acid as an Efficient Catalyst	5

Synthesis of Novel 1,4-Disubstituted Piperazines and Evaluation of Their Antibacterial Activities	5
Synthesis of 5-Methoxy-2-acetyl-1-naphthol	5
Contemporary Developments in the Transition-Metal Catalyzed Synthesis of Indoles. A Review	5
Manganese (II) Chloride Tetrahydrate as an Efficient Catalyst for the Preparation of 5-Aryl-1 H -tetrazoles via [3 + 2] Cycloaddition of S	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
Preparation and Biological Activities of Novel Tetra-arylidene Barbituric Acids Containing Ether Spacers	5
An Efficient and Practical Synthesis of Oseltamivir Phosphate	5
Synthesis of Tetrahydrobenzo[b]pyrans Promoted by Sodium Stearate as a Lewis Base-Surfactant Combined Catalyst in an Aqueous Micellar Medium	5
Highly Stereoselective and Scalable Synthesis of Eldecalcitol	4
A Novel Green Approach to the Synthesis of bis-4-Hydroxycoumarins	4
Preparation of 2,3-Diarylthiazolidin-4-one Derivatives Using Barium Sulfate Nano-Powders	4
Synthesis of Dihydropyrano[2,3- c ]pyrazoles with Trifluoroethanol as a Reusable Promoting Medium: A Green Protocol	4
Melamine, a Recyclable Catalyst for the Synthesis of Dihydropyrano[2,3-c]pyrazoles in Aqueous Ethanol	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
Greener Synthesis of Novel Azo-linked 1,2,4-Triazolidine-3-ones (thiones) Using Recyclable Fe ₃ O ₄ @SP@vanillin@thioglycolic Acid	3
Recent Synthetic Applications of Hypervalent Iodine Reagents. A Review in Three Installments: Installment I	3
Synthesis of “Tablets Impurity” and “Impurity B” of Vigabatrin, an Antiepileptic Drug	3
One Pot Synthesis of Deterenol, a Sympathomimetic Ingredient of the Dietary Supplement Dexaprine	3
Ring Opening Reactions of Epoxides. A Review	3
The Synthesis of gem-Bisamides Using a Carbocationic Catalytic System in Neutral Media	3
Gram Scale Synthesis of Honokiol	3
Carboxymethyl Cellulose (CMC) as a Recyclable and Biodegradable Catalyst: A Greener Solvent-free Preparation of Pyrano[2,3- d ]pyrimidines	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
Synthesis of Dihydropyrano[2,3-C]pyrazoles Using Mandelic Acid as an Efficient Catalyst	3
Application of Fe₃O₄@SiO₂-Propyl@dapsone-copper Complex Nanoparticles as a Magnetically Recoverable Catalyst for the Synthesis of Azo-linked andbis-Benzo[d]imid	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
Comparison of the Accelerating Effects of Two Ionic Liquids in the Oxidation of Alcohols	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
An Efficient Synthesis Process for 3,4-Dichloronitrobenzene Using the Solid Acid Catalyst SZT-0.15	3
SbPh ₃ : An Efficient Catalyst for Dihydropyrimidinone and Dihydropyrimidin-5-carboxamide Synthesis Using the Biginelli Reaction	3
New and Convergent Synthesis of Deucravacitinib	3
Fluorophosphoric Acid Promoted Formation of Imines of Sulfonamides and Dihydropyridines at Room Temperature	3
Synthesis of 2-Amino-4-aryl Thiazoles using Cu-NP/C Heterogeneous Catalyst	2
A Mild Synthetic Method for Selective Conversion of Camphene to Isoborneol Derivatives	2
Synthesis of 3,4-Dihydropyrimidin-2-(1 H )-ones/thiones Catalyzed by Cetyltrimethylammonium Bromide (CTAB) in Aqueous Micellar Media: An Environmentally Responsible Proc	2
Synthesis of Novel 1,2,4-Triazole Derivatives of N-Benzyl-5-nitroisatin: Anticancer Activity, Anti-oxidant Activity, and Molecular Design	2
Design, Synthesis, and Evaluation of Novel 2-(4-Benzylideneamino)phenoxy)acetamides as Antibacterial Agents	2
Multi-gram Preparation of 1-(3-Dimethylamino propyl)-3-ethylurea (EDU)	2
An Alternate Feasible Route for the Synthesis of 4-Aminocoumarin	2
Tartaric Acid as an Expeditious and Green Catalyst for the Synthesis of 1,2,4-Triazolidine-3-thiones in an Aqueous Medium	2
Green Pathway for Solvent-free Synthesis of Tetrahydrobenzo[ b ]pyrans Promoted by Carboxymethyl Cellulose (CMC) as a Recyclable and Biodegradable Catalyst	2
Natural Deep Eutectic Solvent as a Green Catalyst for the One-pot Synthesis of Chromene and 4H-Pyran Derivatives	2
Design, Synthesis, Anticancer Evaluation and Molecular Docking Studies of Amide Derivatives of 1,3,4-Thiadiazolyl Pyridinyl Isoxazoles	2
Curd Water as a Catalytic Solvent for the Preparation of bis -Coumarins	2
Functionalized Pyrimidines: Synthetic Approaches and Biological Activities. A Review	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
Eggshell/Kaolin Calcined System: An Efficient, Green, and Recoverable Catalyst for the One-Pot Biginelli Reaction	2
Synthesis of Novel bis(1,2-Dihydro-4-hydroxy-2-oxoquinolin-3-yl)methanes using DSDABCOC as an Effective Medium	2

Synthesis, Molecular Modeling, and Biological Evaluation of New N-(Benzo[d]thiazol-2-yl)-3-amino-but-2-enamide Derivatives as Cytotoxic Agents	2
Synthesis of Novel Amide Derivatives of the Sesquiterpene Aryl-himachalene	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
Synthesis of N-Benzoyl-4-O-(1H-Tetrazol-5-yl)-L-Tyrosine Ethyl Ester: A Functionalized Tyrosine Derivative	2
Guanidine Hydrochloride Catalyzed Efficient and Expeditious One-Pot Synthesis of 2, 4, 5-Triaryl Imidazole Derivatives	2
A Practical Green Synthesis of ( R )-5,7-difluorochroman-4-ol, a Key Intermediate of Tegoprazan	2
Facile Preparation of 3,6-Dimethoxy-2-nitrobenzaldehyde	2
Recent Developments in Enantioselective Silver-Catalyzed Transformations	2
A Green, Facile, and Efficient Synthesis of 4H-Benzo[b]pyrans Using 2,2’-Bipyridine as a Recyclable Organocatalyst	2
A Concise Account of Synthetic Approaches to 1,2,3-Triazoles	2
Facile Synthesis of Novel Cylopenta[ b ]indoles and Their Biological Assessments	2
Preparation and Biological Evaluation of Thymol Functionalized 2-Pyrazoline and Dihydropyrimidinone Hybrids	2
Sulfated Starch: A Highly Efficient Catalyst for Transamidation of Primary and Secondary Amines with Formamide and Acetamide	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
Catalyst-free On-Water Synthesis of 5-Aminopyrazole-4-carbonitriles as Potential Antifungal Agents	1
A Tris-Aldehyde Porphyrin Synthon: Synthesis and Characterization of 5,10,15-tris-(4’-(4-Formylphenoxy) propoxyphenyl)-20-(4-nitrophenyl)-porphyrin	1
Regioselective Benzylation of N-Boc-N’-COCF₃-protected Hydrazine	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
L-Proline Catalyzed Synthesis of Heterocycles: A Review	1
An Alternative Greener Synthesis of Dibenzalacetone	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
Alcoholysis of N -Substituted Amides and Carboxylic Acid Hydrazides in the Presence of Triflic Acid	1
An Efficient Synthesis of Curcumin Pyrazole Analogues and their Biological Activities	1
ZnCl₂ Catalyzed Ring-Opening Reaction of Symmetrical Epoxides with Aromatic Amines for the Synthesis of 1,2-Amino Alcohols	1
Emerging Approaches for Synthesis of 1,2,3-Triazole Derivatives. A Review	1
Synthesis, Insecticidal Activity and DFT Study of 1,2,4-Triazolidinthione, 1,3,5-Oxadiazine and Thiourea Derivatives	1
An Efficient Solvent-free Synthesis of Spiro-substituted Cyclopropanes by Grinding	1
A Novel Process for the Key Intermediate of Fluoroquinolones	1
Rapid Access to Pyrano[2,3-d]pyrimidines Using Microwave Assisted [EMIM][OH] Catalysis	1
Cu(NO ₃ ) ₂ /HNO ₃ Oxidation of Chloromethyl-aryl-himachalene: Synthesis of a Novel Aldehyde De	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
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
Synthesis of Novel Quinolines with Antibacterial 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 Novel β-Lactams via Substitution Reactions of Thiolaryl Substituted β-Lactam Precursors	1
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
Visible Light Assisted Synthesis of Tetrahydrobenzo[ b ]pyrans Using 4CzIPN, a Carbazole-Based Photocatalyst	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
Fe₃O₄@THAM-SO₃H as an Efficient Heterogeneous Magnetic Nanocatalyst to Access Functionalized Pyrrole and Polyhydroquinoline Derivatives	1
Synthesis of Isoxazole-5(4 H )-ones Using Citrazinic Acid as an Organocatalyst in Aqueous Conditions	1
New and Convergent Synthesis of Finerenone	1
A New One-pot Synthesis of 4-Arylideneisoxazolones Catalyzed by Na ₂ SO ₃ in an Aqueous Medium	1
Ru-based Cross Metathesis in the Synthesis of Glycosteroids	1
Efficient Synthesis of Xanthenediones Using CuCeO₂ Nanoparticle Catalyst in Aqueous Medium	1
Facile Synthesis of Substituted Pyrroles Using Silica Supported Catalysis	1
Novel Synthesis of Multifunctionalized Spiro[benzofurancyclobutanes] via Aqueous Three-component Reaction Catalyzed by Theophylline	1
Synthesis of Lithocholic Acid from Plant-sourced Bisnoralcohol	1
Aluminized Polyborate: A New and Eco-friendly Catalyst for the Synthesis of SymmetricalN,N’-Di(aryl/alkyl)formamidines	1
Synthesis of Substituted N- (4 H -1,2,4-Triazol-4-yl)benzamides as Potential Antifungal Agents	1
An Efficient Synthesis in Water of Novel Oxoquinolines and Their Anticancer Activities	1
Green Approach for Metal-free One-pot Synthesis of Tetrahydrobenzo[b]pyrans with Sodium Alginate as a Reusable Bifunctional Biopolymeric Catalyst	1
A Concise, Economical, and Eco-Friendly Two-Step Synthesis of 1-Adamantylamine Hydrochloride from Adamantane	1
Rapid Efficient Synthesis of 1,2,4-Triazolidine-3-Thiones in Aqueous Medium using Multiphase Bismuth Iron Oxide (mBFO) Catalyst	1
A Brief Review on the Synthesis of Pyrrolo[2,3-c]coumarins, including Lamellarin and Ningalin Scaffolds	1
Preparation of Novel Bisphenanthro[9,10-d]imidazoles with an Efficient Copper Nano Magnetic Catalyst	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
Synthesis of Pharma Europa Impurity-A of Flecainide Acetate	1