34


Direct N-Me Aziridination of Enones

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

J. Org. Chem. 2022, 87, 3751-3757

33


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, DOI: 10.1039/D2NJ02755K

32


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

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

Synthesis, 2022, DOI: 10.1055/a-1879-7974

31


Catalytic Enantioselective Syn-Hydroxy-Oxyacylation of Electron Deficient Alkenes

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

ChemRxiv 2021, DOI: 10.26434/chemrxiv.14345981.v2

30


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. 2021, 86, 12277-12284

29


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. 2021, 363, 4862-4865

28


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. 2021, 86, 12277-12284

27


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*, Jawahar L. Jat*

Chem. Select  2021, 06, 10524-10526

26


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. 2020, 56, 7155-7158

25


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. 2020, 85, 10175-10181

24


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. 2020, 85, 8166-8175

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23


Direct synthesis of secondary amides from ketones through Beckmann rearrangement using O-(mesitylsulfonyl)hydroxylamine

Dinesh Chandra, Soumya Verma, C. B.  Pandey, A. K. Yadav, P. Kumar, Bhoopendra Tiwari*, Jawahar L. Jat*,

Tetrahedron Lett. 2020, 61, 151822-151826

22


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

Soumya Verma, P. Kumar, Anil K. Khatana, D. Chandra, A. K. Yadav, Bhoopendra Tiwari* and Jawahar L. Jat*

Synthesis, 2020, 85, 8166-8175 [ Invited Contribution]

21


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. 2019, 84, 14898-14903

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20


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. 2019, 84, 14161-14167

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19


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

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

J. Org. Chem. 2018, 83, 12255-12260

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18


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

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

Synthesis 2018, 50, 4290-4294 [ Invited Contribution]

17


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. 2018, 83, 9478-9483

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16


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. 2017, 19, 444–447

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15


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

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

J. Am. Chem. Soc. 2013, 135, 8113–8116 [The Most read article of June 2013]

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14

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. Lett. 2013, 15, 5822–5825

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13

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. Lett. 2013, 15, 4956-4959

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12

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

Chem. Commun. 2013, 49, 261–263 [Highlighted in Synfacts]

Graphical abstract: Controlled β-protonation and [4+2] cycloaddition of enals and chalcones via N-heterocyclic carbene/acid catalysis: toward substrate independent reaction control

11

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

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

Org. Lett. 2013, 15, 50–53 [Among top 5 most read articles of the month]

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10

Enantioselective Oxidative Cross‐Dehydrogenative Coupling of Tertiary Amines to Aldehydes

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

Angew. Chem. Int. Ed. 2012, 51, 3649–3652

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09

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. Ed. 2012, 51, 1911–1914

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08

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. Lett. 2012, 14, 5412–5415 [Highlighted in Synfacts]

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07

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. Lett. 2012, 14, 3226–3229

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06

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. 2012, 14, 2382–2385

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05

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

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

Org. Lett. 2012, 14, 1922–1925

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04

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

S. Chandrasekhar, B. Tiwari

Tetrahedron: Asymmetry 2009, 20, 1924–1929

03

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

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

Tetrahedron: Asymmetry 2008, 19, 495–499

02

Asymmetric synthesis of a protected dihydroxy piperazic acid derivative

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

Synthesis 2007, 11, 1677–1682

01

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

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

ARKIVOC 2006, (xi), 155–159

 

Patent

01

Methods of preparing chiral Ketones from aldehydes

B. Tiwari, Y. R. Chi, PCT Int. Appl. (2013), WO 2013095301 A1 20130627