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 2021-05-01 to 2025-05-01.)

Article	Citations
Synthesis of 2,3-Dihydroquinazolinones via Condensation of 2-Aminobenzamides with Aldehydes under Ball Milling Conditions	44
Synthesis and Antiproliferative Evaluation of Novel 5-Substituted Pyridazin-4-Amine Derivatives	21
One Pot Unexpected Isocyanide-based Three-component Synthesis of Pyrrole-3-carboxamides Containing Ether Groups	21
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	20
H ₆ P ₂ W ₁₈ O ₆₂ ·18H ₂	17
Current Advances in Transition Metal-Free Access to Indoles. A Review	15
Microwave-Assisted Iodotrimethylsilane-Promoted Synthesis of Novel Pyrazolyl Chalcones	14
Synthesis and Antiproliferative Evaluation of Novel 5-Aryl Substituted Oxazolo[4,5-b]pyridin-2-amine Derivatives	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
Catalytic Evaluation of Surface Engineered Activated Carbon with SnO ₂ Nanoparticles for Synthesis of Dihydropyrimidinones at Room Temperature	12
Nano-[Fe₃O₄@SiO₂-R-NHMe₂][H₂PO₄] as a Highly Effectual and Magnetically Recyclable Catalyst for the Preparation of bis(6-Amino-1,3-dim	12
Development of an Efficient Alternative Synthesis of the Endothelin Receptor Antagonist Bosentan	11
Design and One-pot Synthesis of Novel Carbazole-based Thiazolone Imines	10
Magnetic Nanoparticle Supported Lewis Acidic Deep Eutectic Solvent (LADES@MNP) for the One-pot Synthesis of 14-Aryl-14- H -dibenzo[a,j]xanthenes	10
Rapid Synthesis of 3-Hydroxyflavones from 2’-Hydroxyacetophenones and Benzaldehydes	10
An Original Transposition of the 4-Fluorobenzylamino Group from 1-(4-Fluorobenzylamino)-1-methylsulfanyl-2-nitroethylene in Triflic Acid^†	9
Eco-Friendly and Efficient Greener Process for the Synthesis of Chalcones and Pyrazolones Using the Supramolecular Catalyst β-Cyclodextrin	9
New Approach for the Synthesis and Purification of Spiro[fluorene-9,5’-[1,3]-dioxan]-2’-one	9
Dendrimer-Functionalized Magnetic Graphene Oxide for Knoevenagel Condensation	9
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	8
An Organocatalytic Biogenic Approach for the Synthesis of Coumarins Using the Pechmann Condensation Reaction	8
Reinvestigating the Preparation of Glyoxime and Its Chlorination by a Slight Overpressure of Chlorine Gas to Prepare Dichloroglyoxime	8
Synthesis of Novel 1,4-Disubstituted Piperazines and Evaluation of Their Antibacterial Activities	7
Efficient Synthesis of trans-3-Amino-1-methylcyclobutan-1-ol	6

Novel Synthetic Access to 24a-Homochol-5-en-24a-oate Scaffold from Stigmasterol	6
Synthesis of Novel Substituted Guanidines and Pyrimidines Using Pyridinium and Methanaminium Salts in Water as a Green Solvent	6
Manganese (II) Chloride Tetrahydrate as an Efficient Catalyst for the Preparation of 5-Aryl-1 H -tetrazoles via [3 + 2] Cycloaddition of S	6
An Efficient and Practical Synthesis of Oseltamivir Phosphate	5
Preparation of 2,3-Diarylthiazolidin-4-one Derivatives Using Barium Sulfate Nano-Powders	5
Recent Advances in 2-Aminobenzothiazole Chemistry: Catalysis in the Preparation of 1-(Benzothiazolylamino)methyl-2-naphthols. A Brief Review	5
Synthesis of Tetrahydrobenzo[b]pyrans Promoted by Sodium Stearate as a Lewis Base-Surfactant Combined Catalyst in an Aqueous Micellar Medium	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
Synthesis of a Nitroxide Spin-labeled Varenicline (Chantix) Derivative	5
A Novel and Rapid Method to Prepare Aminothiazoles	4
A Rapid and Environmentally Benign Access to Hantzsch’s Polyhydroquinolines	4
Preparation and Biological Activities of Novel Tetra-arylidene Barbituric Acids Containing Ether Spacers	4
Melamine, a Recyclable Catalyst for the Synthesis of Dihydropyrano[2,3-c]pyrazoles in Aqueous Ethanol	4
Green Methods for the Synthesis of Pyrazoles: A Review	4
CAN Combined with NaI as Promoter System for the Synthesis of Novel Ethyl 1,2-Diarylpyrrolidine-3-carboxylate Derivatives via Three-Component Reaction	3
A Novel Green Approach to the Synthesis of bis-4-Hydroxycoumarins	3
Recent Synthetic Applications of Hypervalent Iodine Reagents. A Review in Three Installments: Installment I	3
Synthesis of 3-Substituted Indoles Using Deep Eutectic Solvent and Ultrasound	3
One Pot Synthesis of Deterenol, a Sympathomimetic Ingredient of the Dietary Supplement Dexaprine	3
An Efficient Synthesis Process for 3,4-Dichloronitrobenzene Using the Solid Acid Catalyst SZT-0.15	3
Comparison of the Accelerating Effects of Two Ionic Liquids in the Oxidation of Alcohols	3
An Improved Procedure for the Synthesis of Amantadine Hydrochloride	3
One-pot Three-component Synthesis of Novel 1,3,4-Thiadiazole-thiazolo[3,2-a]pyrimidine Derivatives Catalyzed by Molecular Iodine	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
Greener Synthesis of Novel Azo-linked 1,2,4-Triazolidine-3-ones (thiones) Using Recyclable Fe ₃ O ₄ @SP@vanillin@thioglycolic Acid	3
SbPh ₃ : An Efficient Catalyst for Dihydropyrimidinone and Dihydropyrimidin-5-carboxamide Synthesis Using the Biginelli Reaction	3
Highly Stereoselective and Scalable Synthesis of Eldecalcitol	3
Carboxymethyl Cellulose (CMC) as a Recyclable and Biodegradable Catalyst: A Greener Solvent-free Preparation of Pyrano[2,3- d ]pyrimidines	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
Synthesis of “Tablets Impurity” and “Impurity B” of Vigabatrin, an Antiepileptic Drug	3
Solar Energy Mediated Green Synthesis of Tetrahydrobenzo[b]pyrans Using L-Ascorbic Acid as an Organocatalyst in Aqueous Medium	3
Gram Scale Synthesis of Honokiol	3
Solvent-free Acetylation Procedure	3
Curd Water as a Catalytic Solvent for the Preparation of bis -Coumarins	2
New and Convergent Synthesis of Deucravacitinib	2
Ring Opening Reactions of Epoxides. A Review	2
Fluorophosphoric Acid Promoted Formation of Imines of Sulfonamides and Dihydropyridines at Room Temperature	2
Facile Preparation of 3,6-Dimethoxy-2-nitrobenzaldehyde	2
Synthesis of Novel 1,2,4-Triazole Derivatives of N-Benzyl-5-nitroisatin: Anticancer Activity, Anti-oxidant Activity, and Molecular Design	2
Three-Component Synthesis of 1,4-Disubstituted 1,2,3-Triazoles using a Novel and Efficient Nano Alumina Based Cu(II) Catalyst	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
Synthesis of Chromenes Using CuO/ZnO@N-GQDs@NH₂ Nanocomposite as a High Performance Catalyst	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
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
A Practical Green Synthesis of ( R )-5,7-difluorochroman-4-ol, a Key Intermediate of Tegoprazan	2
Guanidine Hydrochloride Catalyzed Efficient and Expeditious One-Pot Synthesis of 2, 4, 5-Triaryl Imidazole Derivatives	2
A Mild Synthetic Method for Selective Conversion of Camphene to Isoborneol Derivatives	2
Recent Developments in Enantioselective Silver-Catalyzed Transformations	2

Multi-gram Preparation of 1-(3-Dimethylamino propyl)-3-ethylurea (EDU)	2
Functionalized Pyrimidines: Synthetic Approaches and Biological Activities. A Review	2
The Synthesis of gem-Bisamides Using a Carbocationic Catalytic System in Neutral Media	2
Synthesis of Dihydropyrano[2,3-C]pyrazoles Using Mandelic Acid as an Efficient Catalyst	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 Concise Account of Synthetic Approaches to 1,2,3-Triazoles	2
Natural Deep Eutectic Solvent as a Green Catalyst for the One-pot Synthesis of Chromene and 4H-Pyran Derivatives	2
An Efficient Regioselective Preparation of Fulvestrant	2
Facile Synthesis of Novel Cylopenta[ b ]indoles and Their Biological Assessments	1
Synthesis of Novel β-Lactams via Substitution Reactions of Thiolaryl Substituted β-Lactam Precursors	1
Microwave-Assisted OPC-VH Mediated Synthesis of 2-Amino-1,3,4-thiadiazoles	1
Synthesis of Novel Quinolines with Antibacterial Activity	1
ZnCl₂ Catalyzed Ring-Opening Reaction of Symmetrical Epoxides with Aromatic Amines for the Synthesis of 1,2-Amino Alcohols	1
Green Approach for Metal-free One-pot Synthesis of Tetrahydrobenzo[b]pyrans with Sodium Alginate as a Reusable Bifunctional Biopolymeric Catalyst	1
CeO₂/CuO@GQDs@NH₂ Nanocomposite as a Reusable Catalyst for the Preparation of bis-Pyrazoles	1
Synthesis, Insecticidal Activity and DFT Study of 1,2,4-Triazolidinthione, 1,3,5-Oxadiazine and Thiourea Derivatives	1
Synthesis of Pharma Europa Impurity-A of Flecainide Acetate	1
Novel Synthesis of Multifunctionalized Spiro[benzofurancyclobutanes] via Aqueous Three-component Reaction Catalyzed by Theophylline	1
An Alternative Greener Synthesis of Dibenzalacetone	1
Aluminized Polyborate: A New and Eco-friendly Catalyst for the Synthesis of SymmetricalN,N’-Di(aryl/alkyl)formamidines	1
A New One-pot Synthesis of 4-Arylideneisoxazolones Catalyzed by Na ₂ SO ₃ in an Aqueous Medium	1
Development of a Novel and Scalable Process for the Synthesis of a Key Nafithromycin Intermediate	1
Preparation and Biological Evaluation of Thymol Functionalized 2-Pyrazoline and Dihydropyrimidinone Hybrids	1
Tartaric Acid as an Expeditious and Green Catalyst for the Synthesis of 1,2,4-Triazolidine-3-thiones in an Aqueous Medium	1
A Green, Facile, and Efficient Synthesis of 4H-Benzo[b]pyrans Using 2,2’-Bipyridine as a Recyclable Organocatalyst	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
Regioselective Benzylation of N-Boc-N’-COCF₃-protected Hydrazine	1
Synthesis of Substituted N- (4 H -1,2,4-Triazol-4-yl)benzamides as Potential Antifungal Agents	1
Magnetic Fe₃O₄@SiO₂ Core–Shell Nanoparticles Functionalized with Sulfamic Acid Polyamidoamine (PAMAM) Dendrimer for the Multicomponent Synthesis of Polyhydroquinolines	1
Expeditious and Highly Efficient One-Pot Synthesis of Functionalized Imidazoles Catalyzed by Sulfated Polyborate	1
A Brief Review on the Synthesis of Pyrrolo[2,3-c]coumarins, including Lamellarin and Ningalin Scaffolds	1
Emerging Approaches for Synthesis of 1,2,3-Triazole Derivatives. A Review	1
Rapid Access to Pyrano[2,3-d]pyrimidines Using Microwave Assisted [EMIM][OH] Catalysis	1
Alcoholysis of N -Substituted Amides and Carboxylic Acid Hydrazides in the Presence of Triflic Acid	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 Isoxazole-5(4 H )-ones Using Citrazinic Acid as an Organocatalyst in Aqueous Conditions	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
Sulfated Starch: A Highly Efficient Catalyst for Transamidation of Primary and Secondary Amines with Formamide and Acetamide	1
Preparation of Novel Bisphenanthro[9,10-d]imidazoles with an Efficient Copper Nano Magnetic Catalyst	1
A Greener Synthesis of N-( p -Toluenesulfonyl)imidazole Using the Bio-Renewable Solvent 2-MeTHF, Companion DFT Studies	1
A Novel Process for the Key Intermediate of Fluoroquinolones	1
Synthesis of Lithocholic Acid from Plant-sourced Bisnoralcohol	1
A Tris-Aldehyde Porphyrin Synthon: Synthesis and Characterization of 5,10,15-tris-(4’-(4-Formylphenoxy) propoxyphenyl)-20-(4-nitrophenyl)-porphyrin	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
Copper Phthalocyanine Tetrasulfonic Acid, a Recyclable Solid Acid Catalyst for the Synthesis of Aryl Iodides and Azides from Aryl Amines via Diazotization	1
Pyridinium Chlorochromate Supported on Montmorillonite–KSF as a Versatile Oxidant under Ball Milling Conditions	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
Fe₃O₄@THAM-SO₃H as an Efficient Heterogeneous Magnetic Nanocatalyst to Access Functionalized Pyrrole and Polyhydroquinoline Derivatives	1
Tetrabutylammonium Iodide/I₂ Mediated Convenient and Green Synthesis of Substituted Organic Isothiocyanates	1
1,2-Diaryl-4,5-diphenyl-1 H -imidazoles: Further Preparative Studies Using Amberlite IR120(H) as a Recyclable Heterogeneous Catalyst	1
An Efficient Solvent-free Synthesis of Spiro-substituted Cyclopropanes by Grinding	1
An Efficient Synthesis of Curcumin Pyrazole Analogues and their Biological Activities	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
Visible Light Assisted Synthesis of Tetrahydrobenzo[ b ]pyrans Using 4CzIPN, a Carbazole-Based Photocatalyst	1
Synthesis of Novel Amide Derivatives of the Sesquiterpene Aryl-himachalene	1
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	1
Green Pathway for Solvent-free Synthesis of Tetrahydrobenzo[ b ]pyrans Promoted by Carboxymethyl Cellulose (CMC) as a Recyclable and Biodegradable Catalyst	1