Tiwari Group

Organocatalytic Access to 3-Pyridylphosphonates from Vinyl Phosphonates and Aldehydes

R. S. Verma, A. K. Khatana, D. Verma, and Bhoopendra Tiwari* 

 Chem. Commun. 2024, 60, 5306-5309.

Iodobenzene Catalyzed Synthesis of Fully Functionalized NH-Pyrazoles and Isoxazoles from α,β- Unsaturated Hydrazones and Oximes via 1,2-Aryl Shift

Vikram Singh, Deepak Kumar, Balkrishna Mishra and Bhoopendra Tiwari*

Org. Lett. 2024, 26, 1, 385–389

Amidation of Enones via Beckmann Rearrangement

Saumya Verma, Vikram Singh, Jawahar L. Jat, and Bhoopendra Tiwari*

J. Org. Chem. 202489, In Press

 

Copper(ii) nanodots stabilized on Cassia fistula galactomannan: preparation and catalytic application towards fast solvent-free Biginelli reactions

Bal Dev Singh, Jyoti Pandey, Huda Khanam, Tazeen Azaz, and Bhoopendra Tiwari*

Org. Biomol. Chem., 2024, 22, 3955-3965

Construction of Highly Functionalized C4-Oxyacylated and Aminated Pyrazolines

Vikram Singh, Balkrishna Mishra, Deepak Kumar and Bhoopendra Tiwari*

Org. Lett. 2023, 2539, 7089-7094

Cassia fistula galactomannan stabilized copper nanocatalyst as an efficient, recyclable heterogeneous catalyst for the fast clickable [3+2] Huisgen cycloadditions in water

J. Pandey, B. SinghH. KhanamBhoopendra TiwariT. AzazR. Singh

Int. J. Bio. Macromol. 2023, 255, 128098

N-Heterocyclic Carbene-Catalyzed Enantioselective [3 + 2] Annulation of Enals with Vinyl Ketones

Tazeen Azaz, Hemlata Mourya, Vikram Singh, Bali Ram and Bhoopendra Tiwari*

J. Org. Chem. 2023, 88, 1219-1226

Reductive Alkenylation of Ketimines via Hydride Transfer from Aldehydes

Tazeen Azaz, Hemlata Mourya, Vikram Singh, Bali Ram and Bhoopendra Tiwari*

J. Org. Chem. 2023, 88, 632-639

Metal-free synthesis of nitriles from aldehydes using N-Boc-O-tosylhydroxylamine as a nitrogen source

Puneet Kumar, Vikram Singh, Jawahar Lal Jat* and Bhoopendra Tiwari*

New J. Chem. 2023, 47, 535-538

Novel Functionalized Spiro [Indoline-3,5′-pyrroline]-2,2′-dione Derivatives: Synthesis, Characterization, Drug-Likeness, ADME, and Anticancer Potential

M. Asif, S. S. Alvi, T. Azaz, A. R. Khan, Bhoopendra Tiwari, B. B. Hafeez and M. Nasibullah

Int. J. Mol. Sci 2023, 24, 7336

Propagative isatin in organic synthesis of spirooxindoles through catalysis (Review)

Mohd Asif, Tazeen Azaz, Bhoopendra Tiwari, Malik Nasibullah

Tetrahedron 2023, 134, 133308

Carbene Catalyzed Asymmetric Synthesis of Selenylated δ-Lactones via [4+2] Annulation of Selenyl Vinyl Ketones and Enals

Ram Subhawan Verma, Ranadeep Talukdar, Tazeen Azaz and Bhoopendra Tiwari* 

Adv. Synth. Catal. 2022, 364, 4031-4035

Metal-free synthesis of secondary amides using N-Boc-O-tosylhydroxylamine as nitrogen source via Beckmann rearrangement

Jawahar Lal Jat,* Puneet Kumar, Soumya Verma, Dinesh Chandra, Vikram Singh and Bhoopendra Tiwari*

  New. J. Chem. 2022, 46, 14782-14785

Metal and Additive-Free Intermolecular Aziridination of Olefins Using N-Boc-O-Tosylhydroxylamine

Jawahar Lal Jat,* Dinesh Chandra, Puneet Kumar, Vikram Singh and Bhoopendra Tiwari* 

Synthesis, 2022, 54, 4513-4520

Direct N-Me Aziridination of Enones

Jawahar Lal Jat,* Ajay K. Yadav, Chandra Bhan Pandey, Dinesh Chandra and Bhoopendra Tiwari* 

J. Org. Chem. 202287, 3751-3757

Catalytic Enantioselective Syn-Hydroxy-Oxyacylation of Electron Deficient Alkenes

Chandra Bhan Pandey, Vikram Singh, Susanta Ghanta and Bhoopendra Tiwari* 

ChemRxiv 2021

A General Method for α-Oxyacylation of Vinyl Ketones Using Koser’s Reagent

Chandra Bhan Pandey, Bal Krishna Mishra, Tazeen Azaz, Hemlata Mourya, Bali Ram, and Bhoopendra Tiwari*

J. Org. Chem. 202186, 17318-17328

Carbene Catalyzed Access to 3,6-Disubstituted α-Pyrones via Michael Addition/Lactonization/Elimination Cascade

Anil Kumar Khatana, Vikram Singh, Manoj Kumar Gupta and Bhoopendra Tiwari*

Adv. Synth. Catal. 2021363, 4862-4865

Stitching Triazoles to Arenes via a Transition Metal-Free Aryne Diels-Alder/1,3-Prototropic Shift/Dehydrobromination Cascade

Ranadeep Talukdar, Vikram Singh, Hemlata Mourya, Malik Nassibullah and Bhoopendra Tiwari*

J. Org. Chem. 202186, 12277-12284

Fe(II)-Catalyzed Synthesis of Unactivated Aziridines (N-H/N-Me) from Olefins Using O-Arylsulfonyl Hydroxylamines

Dinesh Chandra, Ajay K. Yadav, Vikram Singh, Bhoopendra Tiwari* and Jawahar L. Jat*

Chemistry Select 202106, 10524-10526

Access to enantioenriched 4-phosphorylated δ-lactones from β-phosphorylenones and enals via carbene organocatalysis

Ram Subhawan Verma, Anil K. Khatana, Monika Mishra, Shailesh Kumar and Bhoopendra Tiwari*

Chem. Commun. 202056, 7155-7158

Stereoselective Oxidative Rearrangement of Di-Substituted Unactivated Alkenes Using Hypervalent Iodine(III) Reagent

Chandra Bhan Pandey, Tazeen Azaz, Ram S. Verma, Monika Mishra, Jawahar L. Jat and Bhoopendra Tiwari*

J. Org. Chem. 202085, 10175-10181

Global Access to 3/4-Phosphorylated Heterocycles via a Carbene-Catalyzed Stetter Reaction of Vinylphosphonates and Aldehydes

Ram Subhawan Verma, Monika Mishra, Chandra Bhan Pandey and Bhoopendra Tiwari*

J. Org. Chem. 202085, 8166-8175

Direct Synthesis of Secondary Amides from Ketones through Beckmann Rearrangement using O-(Mesitylsulfonyl)Hydroxylamine

Dinesh Chandra, Soumya Verma, Chandra Bhan Pandey, Ajay K. Yadav, Puneet Kumar, Bhoopendra Tiwari* and Jawahar L. Jat*

Tet. Lett.  2020, 61, 151822

Zinc(II)-Catalyzed Synthesis of Secondary Amides from Ketones via Beckmann Rearrangement Using Hydroxylamine-O-sulfonic Acid in Aqueous Media

Soumya Verma, Puneet Kumar, Anil K. Khatana, Dinesh Chandra, Ajay K. Yadav, Bhoopendra Tiwari* and Jawahar L. Jat*

Synthesis202085, 8166-8175 [ Invited Contribution]

Carbene/Base-Mediated Redox Alkenylation of Isatins using β-Substituted Organoselenones and Aldehydes

Atanu Bhaumik, Tazeen Azaz, Vikram Singh, Anil K. Khatana and Bhoopendra Tiwari*

J. Org. Chem. 201984, 14898-14903

Construction of Phenanthrenes and Chrysenes from β-Bromovinylarenes via Aryne Diels–Alder Reaction/Aromatization

Vikram Singh, Ram Subhawan Verma, Anil K. Khatana and Bhoopendra Tiwari*

J. Org. Chem. 201984, 14161-14167

Direct N-H/N-Me Aziridination of Unactivated Olefins Using O-(Sulfonyl)hydroxylamines as Aminating Agents

Shekh Sabir, Chandra Bhan Pandey, Ajay K. Yadav, Bhoopendra Tiwari* and Jawahar L. Jat*

J. Org. Chem.  2018, 83, 12255-12260

A Highly Efficient NHC-Catalyzed Aerobic Oxidation of Aldehydes to Carboxylic Acids

Anil K. Khatana, Vikram Singh, Manoj Kumar Gupta and Bhoopendra Tiwari*

Synthesis 201850, 4290-4294 [ Invited Contribution]

Carbene-Catalyzed Tandem [1,2]-Phospha-Brook/[1,4]-Phosphate Rearrangement: Access to α-Ketophosphates via Controlled Cross-Acyloin Condensation

Ram Subhawan Verma, Chandra Bhan Pandey, Shailesh Kumar and Bhoopendra Tiwari*

J. Org. Chem. 201883, 9478-9483

Direct Construction of 2,3-Dihydroxy-2,3-diaryltetrahydrofurans via N-Heterocyclic Carbene/Base-Mediated Domino Reactions of Aromatic Aldehydes and Vinyl Selenone

Atanu Bhaumik, Ram Subhawan Verma and Bhoopendra Tiwari*

Org. Lett. 201719, 444–447

Catalytic Activation of Carbohydrates as Formaldehyde Equivalents for Stetter Reaction with Enones

J. Zhang, C. Xing, B. Tiwari, Y. R. Chi

J. Am. Chem. Soc2013135, 8113–8116 [The Most read article of June 2013]

Asymmetric Access to the Smallest Enolate Intermediate via Organocatalytic Activation of Acetic Ester

S. Chen, L. Hao, Y. Zhang, B. Tiwari, Y. R. Chi

Org. Lett201315, 5822–5825

Organocatalytic Activation of α-Alkyl Carboxylic Esters as Enolate Precursors to React with α,β-Unsaturated Imines

L. Hao, S. Chen, J. Xu, B. Tiwari, Z. Fu, Y. R. Chi

Org. Lett201315, 4956-4959

Controlled β-Protonation and [4+2] Cycloaddition of Enals and Chalconesvia N-Heterocyclic Carbene/Acid Catalysis: Toward Substrate Independent Reaction Control

Z. Fu, H. Sun, S. Chen, B. Tiwari, G. Li, Y. R. Chi

ChemCommun201349, 261–263 [Highlighted in Synfacts]

Direct α-Functionalization of Simple Aldehydes via Oxidative N-Heterocyclic Carbene Catalysis

J. Mo, R. Yang, X. Chen, B. Tiwari, Y. R. Chi

Org. Lett201315, 50–53 [Among top 5 most read articles of the month]

Enantioselective Oxidative Cross‐Dehydrogenative Coupling of Tertiary Amines to Aldehydes

J. Zhang, B. Tiwari, C. Xing, X. Chen, Y. R. Chi

Angew. Chem. Int. Ed201251, 3649–3652

Facile Access to Chiral Ketones through Metal-free Oxidative C-C Bond Cleavage of Aldehydes by O2

B. Tiwari, J. Zhang, Y. R. Chi

Angew. Chem. Int. Ed201251, 1911–1914

Highly Enantioselective Addition of Enals to Isatin-Derived Ketimines Catalyzed by N-Heterocyclic Carbenes: Synthesis of Spirocyclic γ-Lactams

H. Lv, B. Tiwari, J. Mo, X. Chong, Y. R. Chi

Org. Lett201214, 5412–5415 [Highlighted in Synfacts]

Enantioselective Intramolecular Formal [2+4] Annulation of Acrylates and α,β– Unsaturated Imines Catalyzed by Amino Acid-Derived Phosphines

Z. Jin, R. Yang, Y. Du, B. Tiwari, R. Ganguly, Y. R. Chi

Org. Lett201214, 3226–3229

Access to Spirocyclic Oxindoles via N-Heterocyclic Carbene-Catalyzed Reactions of Enals and Oxindoles-Derived α,β-Unsaturated Imines

K. Jiang, B. Tiwari, Y. R. Chi

Org. Lett. 201214, 2382–2385

Addition of Indoles to Oxyallyl Cations for Facile Access to α-Indole Carbonyl Compounds

Q. Tang, X. Chen, B. Tiwari, Y. R. Chi

Org. Lett201214, 1922–1925

Synthesis of the C10-C24 fragment of (+)-Cannabisativine

Chiral pyrrolidine-triazole conjugate catalyst for asymmetric Michael and Aldol reactions

S. Chandrasekhar, B. Tiwari, B. B. Parida, C. R. Reddy

Tetrahedron: Asymmetry 200819, 495–499

Asymmetric synthesis of a protected dihydroxy piperazic acid derivative

S. Chandrasekhar, G. Parimala, B. Tiwari, C. Narsihmulu, G. D. Sarma

Synthesis 200711, 1677–1682

Concise synthesis of truncated pachastrissamine (jaspine B) and its enantiomer

S. Chandrasekhar, B. Tiwari, S. J. Prakash

ARKIVOC 2006, (xi), 155–159

Patents

4

A process for the synthesis of α,β-unsaturated amides

Jawahar L. Jat, Soumya Verma, Vikram Singh and Bhoopendra Tiwari

Indian patent (2023); Application No. 202311036104

3

Method for Metal-Free Synthesis of Secondary Amides using N-Boc-O-Tosylhydroxylamine as Nitrogen Source via Beckmann Rearrangement

Jawahar L. Jat, Puneet Kumar, Soumya Verma, Dinesh Chandra, Vikram Singh and Bhoopendra Tiwari

Indian patent (2023); Application No. 202211077495

2

Novel Method for Metal-Free Synthesis of Nitriles from Aldehydes using N-Boc-O-Tosylhydroxylamine as Nitrogen Source 

Puneet Kumar, Vikram Singh, Jwahar L. Jat and Bhoopendra Tiwari

 Indian patent (2023); Application No. 202211077473

1

Methods of Preparing Chiral Ketones from Aldehydes

Bhoopendra Tiwari and Yonggui R. Chi

Indian patent (2013), WO 2013095301 A1 20130627