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 2020-04-01 to 2024-04-01.)

Article	Citations
Greener Synthesis of 3,4-Disubstituted Isoxazole-5(4H)-ones in a Deep Eutectic Solvent	24
Nanostructural Cu-Doped ZnO Hollow Spheres as an Economical and Recyclable Catalyst in the Synthesis of 1H-pyrazolo[1,2-b]phthalazine-5,10-diones and Pyrazolo[1,2-a][1,2,4]triazol	19
Dendrimer-Functionalized Magnetic Graphene Oxide for Knoevenagel Condensation	18
Magnetic Fe₃O₄@SiO₂ Core–Shell Nanoparticles Functionalized with Sulfamic Acid Polyamidoamine (PAMAM) Dendrimer for the Multicomponent Synthesis of Polyhydroquinolines	17
Ring Opening Reactions of Epoxides. A Review	15
A Concise and Efficient Synthesis of Novel Alkylated 2-(2-hydroxyphenyl)-4,5-diphenylimidazole-based Ionic Liquids Using the MAOS Technique	14
Sulfated Polyborate Catalyzed Selective Friedlander Annulation for Synthesis of Highly Functionalized Quinolines	14
Facile and Efficient Synthesis of Bicyclic ortho-Aminocarbonitrile Derivatives Using Nanostructured Diphosphate Na₂CaP₂O₇	13
Facile Protocol for the Synthesis of 2-Amino-4H-Chromene Derivatives using Choline Chloride/Urea	13
Green Synthesis of Copper Oxide Nanoparticles with an Extract of Euphorbia maculata and Their Use in the Biginelli Reaction	13
Eco-friendly Preparations of Heterocycles Using Fruit Juices as Catalysts: A Review	11
Glycine as a Green Catalyst for the Preparation of Xanthenes	11
Design of 2-Carboxy-1-sulfopyridin-1-ium Chloride as an Efficient and Eco-friendly Catalyst for the One-pot Synthesis of Highly Functionalized Tetrahydropyridines	11
Three-Component Synthesis of 1,4-Disubstituted 1,2,3-Triazoles using a Novel and Efficient Nano Alumina Based Cu(II) Catalyst	9
Catalyst-free Synthesis of Pyrano[2,3-d]pyrimidine Scaffolds via Knoevenagel-Michael Cyclocondensation Using PEG-400 as a Green Promoting Medium	9
Caffeine as a Naturally Green and Biodegradable Catalyst for Preparation of Dihydropyrano[2,3-c]pyrazoles	9
Expeditious and Highly Efficient One-Pot Synthesis of Functionalized Imidazoles Catalyzed by Sulfated Polyborate	9
Synthesis of 3-Substituted Indoles Using Deep Eutectic Solvent and Ultrasound	8
Green Methods for the Synthesis of Pyrazoles: A Review	8
Biowaste-Derived Heterogeneous Catalyst for the One-Pot Multicomponent Synthesis of Diverse and Densely Functionalized 2-Amino-4H-Chromenes	8
An Efficient Synthesis of Substituted Imidazoles Catalyzed by 3-N-Morpholinopropanesulfonic Acid (MOPS) under Ultrasound Irradiation	8
A Highly Effectual and Rapid Protocol for the Synthesis of 5-Amino-1,3-diaryl-1H-pyrazole-4-carbonitriles Using 1,3-Disulfonic Acid Imidazolium Trifluoroacetate as a Dual-Functional Catalyst	8
A New Multicomponent Reaction for the Synthesis of Amides	8
Friedländer Synthesis of Novel Polycyclic Quinolines Using Solid SiO₂/H₂SO₄ Catalyst	8
Silica Sulfuric Acid/Ethylene Glycol: An Efficient Eco-Friendly Catalyst for One-Pot Synthesis of New Benzo[4,5]imidazo[1,2-a]pyrimidines	7

Application of [PVP-SO₃H] HSO₄ as an Efficient Polymeric-Based Solid Acid Catalyst in the Synthesis of Some Benzimidazole Derivatives	7
Ultrasound-Promoted One-Pot Three-Component Synthesis of β–Amino Carbonyl Compounds Using Manganese Perchlorate	7
Recent Trends in the Chemistry of [1,2,4]Triazole[1,5-a]pyrimidines	7
Ultrasound Promoted Green Synthesis of Spiro Indoline-3,4′-pyrano[2,3-c]pyrazoles	7
Preparation of Novel Chiral α-Diazocarbonyl Compounds Using Regitz’s Methodology	7
Green Approach for Metal-free One-pot Synthesis of Tetrahydrobenzo[b]pyrans with Sodium Alginate as a Reusable Bifunctional Biopolymeric Catalyst	7
Solvent- and Catalyst-Free Synthesis of 6H-Chromeno [4,3-b]quinolin-6-ones	7
Synthesis and Antibacterial Activity of Novel 1,3-Oxazine Derivatives	7
One-pot Synthesis of Pyranoquinoline Derivatives Using a New Nanomagnetic Catalyst Supported on Functionalized 4-Aminopyridine (AP) Silica	6
Solvent-free Synthesis of Halogenated Furo[2,3-d] pyrimidines and Their Cytotoxic Activity on the T47D Breast Cancer Cell Line	6
Solvent-free, Efficient Transamidation of Carboxamides with Amines Catalyzed by Recyclable Sulfated Polyborate Catalyst	6
A Brief Review on the Synthesis of Pyrrolo[2,3-c]coumarins, including Lamellarin and Ningalin Scaffolds	6
Solvent-free Synthesis of Pyrano[2,3-d]pyrimidine Scaffolds Using per-6-NH₂-β-CD as a Reusable Supramolecular Host	6
A New Approach to the Total Synthesis of 20-Deethyltubifolidine and an Entry to the Azocino[4,3-b]indoles	6
An Efficient Synthesis of Novel Imidazo-Aminopyridinyl Derivatives from 2-Chloro-4-cyanopyridine	6
Curcumin-Derived Heterocycles as Anticancer Agents. A Systematic Review.	5
One-Pot Expeditious Synthesis of 2-Amino-4,6-(disubstituted)nicotinonitriles Using Activated Fuller’s Earth as Catalyst	5
BTMA-Br₃ Promoted One Pot Synthesis of 1, 8-Dioxo-octahydroxanthenes under Eco-friendly Conditions	5
Natural Deep Eutectic Solvent as a Green Catalyst for the One-pot Synthesis of Chromene and 4H-Pyran Derivatives	5
Synthesis of Pyran Annulated Heterocyclic Compounds under Catalyst Free Conditions Using Aqueous Ethylene Glycol	5
Synthesis of Isoxazole-5(4 H )-ones Using Citrazinic Acid as an Organocatalyst in Aqueous Conditions	5
Current Advances in Transition Metal-Free Access to Indoles. A Review	5
Ionic-liquid Promoted Multi-component Preparation of Pyrazolo[3,4-d]thiazolo[3,2-a]pyrimidines under Solvent-free Conditions	5
Synthetic Applications of a New Magnetic Mesoporous Nanocomposite Catalyst Fe₃O₄@MCM-41@NH-SO₃H	5
Soluble Glass, an Efficient Promoter for the Cascade Addition-Cyclization Reaction of 4-Hydroxycoumarins to Chalcone Derivatives	5
Synthesis and Characterization of New Chalcone Derivatives of Aryl-Himachalene	4
A Convenient Synthesis of Rivaroxaban from (S)-Epichlorohydrin	4
An Improved Approach to the Synthesis of (±)-Noruleine	4
Emerging Approaches for Synthesis of 1,2,3-Triazole Derivatives. A Review	4
Ultrasound-Assisted Heterogeneous Oxidation of 1,4-Dihydropyridines	4
Tetrabutylammonium Iodide/I₂ Mediated Convenient and Green Synthesis of Substituted Organic Isothiocyanates	4
Preparation and Biological Activities of Novel Cuminaldehyde Derivatives	4
Chemoselective Benzylic Oxidation of Alkyl-Substituted Aromatics to Ketones with trans-3,5-Dihydroperoxy-3,5 Dimethyl-1,2-Dioxolane	4
Synthesis of Triazolothiones Using Nano-Fe₃O₄@SiO₂-SO₃H as a Heterogeneous Catalyst	4
Facile Construction of 1H-Pyrazolo[1,2-a]pyridazine-5,8-diones via Acid-promoted One-pot Three-component Reaction	3
Aluminized Polyborate: A New and Eco-friendly Catalyst for the Synthesis of SymmetricalN,N’-Di(aryl/alkyl)formamidines	3
Eco-Friendly and Efficient Greener Process for the Synthesis of Chalcones and Pyrazolones Using the Supramolecular Catalyst β-Cyclodextrin	3
The Use of MnCoFe₂O₄@GT@Cu Magnetic Nanoparticles in the Synthesis of Benzopyrans	3
Solar Energy Mediated Green Synthesis of Tetrahydrobenzo[b]pyrans Using L-Ascorbic Acid as an Organocatalyst in Aqueous Medium	3
Cu(II)/Triazine-Based Dendrimer as an Efficacious Recoverable Nano-catalyst for the Preparation of 1-Substituted-1H-1,2,3,4-Tetrazoles under Solventless Conditions	3
An Improved Synthesis of Memantine Hydrochloride	3
An Improved Synthesis of Polyfunctional Acyl Azides in PEG 400	3
One-pot Synthesis of Benzimidazoles Using H₂SO₄@HTC as Catalyst	3
Nano-[Fe₃O₄@SiO₂-R-NHMe₂][H₂PO₄] as a Highly Effectual and Magnetically Recyclable Catalyst for the Preparation of bis(6-Amino-1,3-dim	3
An Efficient Regioselective Preparation of Fulvestrant	3
An Efficient One-Pot Synthesis of 2-Aryl-4,5-diphenyl-1H-imidazoles with Amberlite IR-120(H) as a Reusable Heterogeneous Catalyst	3
Development of 7-Aminopyrazolo[1,5-a]pyrimidines as Anti-Candida and Antibacterial Agents	3
Synthesis of Dihydropyrano[2,3-C]pyrazoles Using Mandelic Acid as an Efficient Catalyst	3
Catalytic Application of 1,4-Piperazinediethanesulfonic Acid (PIPES) for the One-pot Multicomponent Synthesis of Pyrano[4,3-b]pyrans	3
DABCO-catalyzed Five-component Domino Protocol for the Synthesis of Novel Benzo[a]pyrazolo[4’,3’:5,6]pyrano[2,3-c]phenazines in PEG-400 as an Efficient Green Reaction Medium	3

One-pot Preparation of Novel 1,4-Dihydropyridines in the Presence of SBA-15-SO₃H	3
Synthesis of Lithocholic Acid from Plant-sourced Bisnoralcohol	2
An Improved Process for Synthesis of (S)-Duloxetine Hydrochloride Involving Enzymatic Asymmetric Carbonyl Reduction on a Novel Ketoamine	2
Choline Chloride-based Eutectic Mixtures for Greener Synthesis of Quinoxaline-2,3-diol Derivatives and Terephthalaldehyde bis-(2-Aminophenylimine)	2
Preparation of Thiazolidin-4-ones Using NiFe₂O₄@SiO₂ Grafted Propylsulfonic Acid as an Efficient Catalyst	2
A Practical Green Synthesis of bis(Pyrazolyl)methanes Using Mohr’s Salt	2
A New, Highly Efficient and Green Protocol for the Synthesis of Pyranochromenes	2
Convenient OPC-VH Mediated Synthesis of 4-Functional Pyrazoles	2
An Efficient and Highly Asymmetric Synthesis of (S)-2’,6’-Dimethyltyrosine	2
A Synthesis of Novel Selenophenes from Activated Acetylenes, Ethyl 2-Cyano-3-arylacrylate and Potassium Selenocyanate	2
Synthesis and Antiproliferative Evaluation of Novel 5-Aryl Substituted Oxazolo[4,5-b]pyridin-2-amine Derivatives	2
Aluminized Polyborate: A New and Eco-friendly Catalyst for One-pot Multicomponent Synthesis of 1,3-Diaryl-3-(arylamino)propan-1-ones via Mannich Reaction	2
A New Julia-Kocienski Reagent for Convenient Access to the 2-Naphthylmethyl Vinyl Ethers	2
Efficient TBAI-CS₂ Promoted Synthesis of Substituted Hydrazinecarbodithiolates	2
Efficient Synthesis of Xanthenes Using Silica-Supported Phosphotungstic Heteropoly Acid (PW/SiO2)	2
Microwave Assisted Synthesis of Thalidomide on Hectogram Scale	2
Magnetic Graphene Oxide Bearing ZrO₂ as a New Composite Catalyst for the Synthesis of 1H-Perimidines	2
Regioselective, Efficient and Sustainable Bromination Process for the Synthesis of the Antimicrobial Agent Bromiphen Bromide	2
Facile Method for the Synthesis of Cyanoacrylates by Knoevenagel Condensation	2
Keggin-Type Heteropoly-11-molybdo-1-vanadophosphoric Acid Supported on Montmorillonite K-10 Clay as a Catalyst for the Synthesis of Indeno[1,2-b]quinolinones: A Solvent-Free Approach	2
Synthesis of Dihydropyrano[2,3-c]pyrazoles Using Carboxymethyl Cellulose as a Recyclable Catalyst	2
Nano-Mn-[4-Benzyloxyphenyl-salicylaldimine-methylpyranopyrazole-carbonitrile]Cl₂as a New Schiff Base Complex and Catalyst for the Synthesis of Highly Substituted Tetrahydropyridines	2
Recent Synthetic Applications of Hypervalent Iodine Reagents. A Review in Three Installments: Installment I	2
A Convenient Preparation of Muconaldehyde Using a One-Pot Acid-to-Aldehyde Reduction Protocol	2
Synthesis of 2-Benzoylbenzofurans via Palladium(II)-catalyzed Cascade Reactions	2
Fe₃O₄@THAM-SO₃H as an Efficient Heterogeneous Magnetic Nanocatalyst to Access Functionalized Pyrrole and Polyhydroquinoline Derivatives	2
CeO₂/CuO@GQDs@NH₂ Nanocomposite as a Reusable Catalyst for the Preparation of bis-Pyrazoles	2
Facile, Expeditious and Cost-effective Preparation of N-Phthaloyl (S)-Amino Acids and Their in silico Activities against Staphylococcus Aureus	1
Synthesis of 8-Aryl(alkyl)-6-selenoxo-6H-1,9-dioxa-7-aza-cyclopenta[a]naphthalen-3-ones Under Solvent-free Conditions at Ambient Temperature	1
Ru-based Cross Metathesis in the Synthesis of Glycosteroids	1
Preparation and Properties of Some New Pyrazole Derivatives	1
Synthesis and in vitro Fungitoxic Evaluation of Syringaldehyde Schiff Bases and β-Lactams	1
Facile Synthesis of Novel Cylopenta[ b ]indoles and Their Biological Assessments	1
Catalyst-free Facile Synthesis of Novel Fused Spiro[benzo[4,5]thiazolo[3,2-a]pyrano[2,3-d]pyrimidine-4,3'-indoline]-3-carbonitrile Derivatives via One-pot Three-Component Reaction	1
Green Synthesis of Aryl Naphthoxazine-2-thiones Using NiFe₂O₄@SiO₂ⁿPr@GA Under Ultrasound Irradiation	1
Efficient and Practical Synthesis of Saflufenacil	1
An Improved Preparation of Azilsartan	1
Synthesis of Novel Quinolines with Antibacterial Activity	1
An Improved Synthesis of Sulfonyl Azides in Ionic Liquids	1
A Practical Alternate Synthesis of Tucatinib	1
One-pot Three-component Synthesis of Novel 1,3,4-Thiadiazole-thiazolo[3,2-a]pyrimidine Derivatives Catalyzed by Molecular Iodine	1
Polystyrene Sulfonic Acid Promoted Synthesis of 14-Aryl-14H-dibenzo[a,j]xanthenes	1
Zn-Mediated Selective Reduction of Nitroarenes: A Sustainable Approach for Azoxybenzenes Synthesis	1
A Practical, Wastewater-free Synthesis of m-Aminophenol and 3-(Dibutylamino)phenol	1
The Synthesis of gem-Bisamides Using a Carbocationic Catalytic System in Neutral Media	1
Synthesis and Characterization of New Quinoline Bounded Pentamethine Cyanine Dyes	1
L-Proline Catalyzed Synthesis of Heterocycles: A Review	1
Catalytic Switching in the Multi-component Synthesis of Novel Thioethers Based on 4-Hydroxy-2-pyridones	1
4-Fluoro-5-methylacridine: In Search of Long-Range “Lone-Pair Mediated” H-F and C-F Spin-Spin Coupling	1
Eco-friendly Solvent-free Route to Alkyl- and Aryl-Bisphenols Catalyzed by Perchloric Acid-Silica	1
An Efficient Procedure for the Synthesis of 2-Arylsubstituted Benzimidazoles Catalyzed by Co (II) Immobilized on Fe₃O₄@SiO₂-NH₂/EP@SAA as a Recyclable Nanom	1
Efficient Synthesis of Xanthenediones Using CuCeO₂ Nanoparticle Catalyst in Aqueous Medium	1
Preparation of 2,3-Diarylthiazolidin-4-one Derivatives Using Barium Sulfate Nano-Powders	1
Synthesis of Thiazolidin-4-ones Using Novel Magnetic Nanoparticles Modified with S-Proline	1
Nanocomposite Fe₃O₄@GO-NH as a Reusable Heterogeneous Catalyst for the Three-component Synthesis of 2-Amino-4H-chromenes	1
Microwave-Assisted OPC-VH Mediated Synthesis of 2-Amino-1,3,4-thiadiazoles	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
Synthesis of a Nitroxide Spin-labeled Varenicline (Chantix) Derivative	1
ZnCl₂ Catalyzed Ring-Opening Reaction of Symmetrical Epoxides with Aromatic Amines for the Synthesis of 1,2-Amino Alcohols	1
Synthesis of Novel 1,4-Disubstituted Piperazines and Evaluation of Their Antibacterial Activities	1
Tartaric Acid as an Expeditious and Green Catalyst for the Synthesis of 1,2,4-Triazolidine-3-thiones in an Aqueous Medium	1
Application of Fe₃O₄@SiO₂-Propyl@dapsone-copper Complex Nanoparticles as a Magnetically Recoverable Catalyst for the Synthesis of Azo-linked andbis-Benzo[d]imid	1
Novel Synthetic Access to 24a-Homochol-5-en-24a-oate Scaffold from Stigmasterol	1
Synthesis, Insecticidal Activity and DFT Study of 1,2,4-Triazolidinthione, 1,3,5-Oxadiazine and Thiourea Derivatives	1
Sulfated Starch: A Highly Efficient Catalyst for Transamidation of Primary and Secondary Amines with Formamide and Acetamide	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
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
1,2-Diaryl-4,5-diphenyl-1 H -imidazoles: Further Preparative Studies Using Amberlite IR120(H) as a Recyclable Heterogeneous Catalyst	1
Preparation and Biological Evaluation of Thymol Functionalized 2-Pyrazoline and Dihydropyrimidinone Hybrids	1
An Efficient Synthesis of Novel 1,3,5-Triazine-2-selenones from Acyl Isoselenocyanates and 2-Aminobenzimidazole	1
Continuous-Flow Process for the Preparation of m-Dinitrobenzene from Nitrobenzene	1
Recent Synthetic Applications of Hypervalent Iodine Reagents. A Review in Three Installments: Installment III	1
An Improved Synthesis of DOPO-POSS	1
Alcoholysis of Primary Amides in the Presence of CF₃SO₃H	1
One Pot Biginelli Synthesis of Novel 3,4-Dihydropyrimidin-2(1H)-ones Catalyzed by Sulfamic Acid	1