Publications

Khanna, K., Upreti, G. C., Sharma, P., Sharma, S., Singh, A.* “Visible Light-Mediated Spiroannulation of o-Alkynyl Acrylamides Using Excited-State Palladium Catalysis” J. Org. Chem 2025, 90, 26, 9124–9128, https://doi.org/10.1021/acs.joc.5c00968

Rawat, N., Sharma, P., Reddy, N. S., Vilas, A., Singh, A.* “Organophotocatalyzed Radical Hydrophosphonylation of Acrylates, α,β-Unsaturated Ketones, Coumarins, Quinoxalinones, and p-Quinone Methides” J. Org. Chem 2025, https://doi.org/10.1021/acs.joc.5c00767

Ugwu, D. I., Upreti, G. C., Garg, A.*, Singh, A.*, “Ni(OAc)2 Catalyzed N-Formylation of Primary Sulfonamides Using Carbon Dioxide at Ambient Pressure” Eur. J. Org. Chem  2025, https://doi.org/10.1002/ejoc.202500369

Sharma, P., Singh, T., Rawat, N., Singh, A.*, “Visible-Light-Mediated, LMCT-Enabled C(sp3)-H Bond Alkylation of Alkanes and Silanes via C-4 Functionalization of Coumarins” J. Org. Chem  2025, https://doi.org/10.1021/acs.joc.5c00265

Arora, S., Katiyar, P., Singh, T., Singh, A.*, “Visible-Light Mediated, Dual-Catalysis Enabled Allylic Difluoroalkylation via Halogen Atom Transfer” Org. Lett.  2025, https://doi.org/10.1021/acs.orglett.5c00726

Nasireddy, S. R., Sharma, P., Khanna, K., Singh, A.*, “Visible-Light-Mediated Decarboxylative (Amino)Alkylation of Azomethine Imines” J. Org. Chem  2025, https://doi.org/10.1021/acs.joc.5c00159

Arora, S., Sinha, A., Singh, T., Singh, A.*, “Haloalkane Driven Dichotomous Reactivity of Aryl Radical as Halogen and Hydrogen Atom Transfer Agent: Photocatalytic Olefin and Alkyne Functionalization Cascades” Chem. Commun. 2025, https://doi.org/10.1039/D4CC06592A

Khanna, K., Upreti, G. C., Singh, A.*, “Pd-Catalyzed Photochemical Reductive Alkylation of Quinoxalinones and Dibenzoxazepines” J. Org. Chem. 2025, 90, 9, 3123–3127.

Upreti, G. C., Sahoo, D., Singh, A.*, “Photochemical Fluoroalkylation and Alkylthiolation of o-Cyano and o-alkynyl Acrylamides: Pendant Functionality Led Divergence in Annulations” Eur. J. Org. Chem. 2024, e202400640.

Arora, S., Singh, T., Singh, A.*, “Photocatalytic C2-Trifluoroethylation and Perfluoroalkylation of 3-Substituted Indoles Using Fluoroalkyl Halides” Org. Biomol. Chem. 2024, 22, 4278-4282.

Upreti, G. C., Singh, T., Khanna, K., Sahoo, D., Singh, A.*, “Photocatalytic, α-Aminoalkyl Radical-Mediated, Methylene-Extrusive Ring-Closing Transformation of o-Alkynyl and o-Cyano Acrylamides” Org. Lett. 2024, 26, 17, 3652–3656.

Reddy, N. S., Upreti, G.C., Singh, A.*, “Photochemical Trifluoromethylative Difunctionalization of Styrenes and Phenylacetylenes via a Catalytic EDA Platform” Eur. J. Org. Chem. 2024, 27(17), e202400114.

Upreti, G.C., Singh, T., Chaudhary, D., Singh, A.*, “Cascade Cyclizations Triggered by Photochemically Generated Carbamoyl Radicals Derived from Alkyl Amines” J. Org. Chem. 2023, 88, 16, 11801–11808.

Singh, T., Upreti, G.C., Arora, S., Chauhan, H., Singh, A.*, “Visible-light mediated, oxygen-promoted regioselective cross-dehydrogenative coupling of coumarins and dimethylanilines” Org. Biomol. Chem. 2023, 21, 6671-6674.

Singh, T., Nasireddy, S.R., Upreti, G.C., Arora, S., Singh, A.*, “Photocatalytic, Intermolecular Olefin Alkylcarbofunctionalization Triggered by Haloalkyl Radicals Generated via Halogen Atom Transfer” Org. Lett 2023, 25, 30, 5558–5562.

Singh, S.P., Arora, S., Singh, A.*, “FeCl3 Catalyzed Three‐Component Synthesis of Spirochromans and Dihydrocoumarins” AsianJ. Org. Chem. 2023, https://onlinelibrary.wiley.com/doi/10.1002/ajoc.202300279.

Garg, P., Singh, T., Singh, A.*, “Visible light-mediated ring-ablative functionalization of oxazoles: oxidative azidation and demethylative amination” Chem. Commun. 2023, 59, 9360-9363.

Srivastava, S., Ranjan, S., Yadav, L., Sharma, t., Chaudhary, S., Agarwal, D., Satapathi, S., Singh, A.*, Gupta, R.K.*, Garg, A.*, Nalwa, K.S.* “​Advanced Spectroscopic Techniques for Characterizing Defects in Perovskite Solar Cells" Commun Mater 4, 52 (2023). https://doi.org/10.1038/s43246-023-00379-y

Arora, S., Singh, T., Mondal, U., Singh, A.*, “Visible Light Mediated Halogen Atom Transfer to Access Polyhalogenated and Deuterated Lactams from Alkyl Halides” Eur.J. Org.Chem.2023,e202300469.

Singh, S.P., Arora, S., Bhardwaj, P.K., Singh, A.*, “Annulation of Quinone Methides with 2-Benzylidene Dithiolanes: Synthesis of Spirochroman Dithiolanes” Org. Biomol. Chem., 2023, 21, 4962–4966.

Upreti, G.C., Singh, T., Khanna, K., Singh, A.*, “Pd-Catalyzed Photochemical Alkylative Functionalization of C═C and C═N Bonds” J. Org. Chem., 2023, 88, 7, 4422–4433.

Singh, T., Upreti, G. C, Arora, S., Chauhan, H., Singh, A.*, “Visible Light-Mediated Carbamoylation of para-Quinone Methides” J. Org. Chem. 2023, 88, 5, 2784–2791.

Arora, S., Singh, S.P., Sharma, P., Singh, A.*, “Brønsted acid catalyzed annulations of ketene dithioacetals: synthesis of 3-aryl coumarins and indenes” Org. Biomol. Chem., 2022, 20, 8907-8911.

Panday, P., Singh, A.*, “Selectfluor Mediated Difunctionalization of Olefins Towards the Synthesis of Fluoromethylated Morpholines” Eur. J. Org. Chem. 2022; doi.org/10.1002/ejoc.202101543.

Singh, T., Panday, P., Upreti, G. C., Ranjan, S., Gupta, R. K, Singh, A.* “Visible-light-mediated synthesis of α,β-diamino esters via coupling of N,N-dimethylanilines and glyoxalic oxime ethers”, Org. Biomol. Chem. 2022, 2022, 20, 4522-4525.

Garg, P., Upreti, G. C., Singh, A.* “Synthesis of Tritylones via Cascade Reaction of Arynes with 5-Ethoxyoxazoles”, J. Org. Chem. 2022, 87, 11, 7219–7228.

Upreti, G. C., Singh, T., Singh, A.* “Visible-light Mediated Three Component Cascade Sulfonylative Annulation”, ACS Omega 2022, 7, 34, 29728–29733.

Jadhav, S. D., Singh, T., Thakur, N., Singh, A.* “Silver Triflate Catalyzed Domino Reactions of o-Alkynylanilines: An Approach Toward Unsymmetrical Diarylacetates and Triarylmethanes” Asian J. Org. Chem. 2022, doi.org/10.1002/ajoc.202200011.

Ranjan, S., Ranjan, R.,Tyagi, A., Rana, K. S., Soni, A., Kodali, H. K., Dalal, V., Singh, A. *, Garg A. *; Nalwa, K.S. *, Gupta, R. K.* “Low-Temperature Microwave Processed TiO2as an Electron Transport Layer for Enhanced Performance and Atmospheric Stability in Planar Perovskite Solar Cells”, ACS App. Energy Mat. 2022, 5, 2679-2696.

Balasubramaniam, B.; Prateek; Ranjan, S.; Saraf, M.; Kar, P.; Singh, S. P.; Thakur, V. K.; Singh, A.*; Gupta, R. K.* “Antibacterial and Antiviral Functional Materials: Chemistry and Biological Activity toward Tackling COVID-19-like Pandemics”, ACS Pharmacol. Transl. Sci. 2021, 4, 8–54.

Sathiyan, G., Mathivanan, D., Bhuvaneshwari, B.; Garg, A.*; Gupta, R. K.*, Singh, A.* “Olefin-linked conjugated fluorescent oligomer: Design, synthesis, photophysical studies and detection of nitroaromatic compounds (NACs) in aqueous media” Sensors and Actuators A: Physical 2021, 331, 113026.

Ranjan, R. Ranjan, S., Singh, A. * Garg, A.* and R. K. Gupta*, Enhanced thermal and moisture stability via dual additives approach in methylammonium lead iodide based planar perovskite solar cells, Solar Energy 2021, 255, 200-210.

Tailor, N. K., Yukta, Ranjan, R., Ranjan, S., Sharma, T., Singh, A. *, Garg, A. *, Nalwa, K. S. *, Gupta, R. K. *, Satapathi, S.* The effect of dimensionality on the charge carrier mobility of halide perovskites. J. Mater. Chem. A, 2021, 9, 21551-21575.

Tiwari, V.; Singh, A*, “Intermolecular fluoroamination of allenes towards substituted vinyl fluorides”, Org. Biomol Chem. 2020, 18, 9044-9049.

Jadhav, S.D.; Singh, T.; Singh, A.*, “Brønsted acid promoted C–C bond formation between indolylmethyl electrophiles and ketene dithioacetals: Diastereoselective synthesis of highly functionalized cyclopenta[b]indoles” Tetrahedron Lett. 2020, 61, 152349.

Singh, R. Ranjan, S. Ranjan, A. Singh*, A. Garg* and R. K. Gupta*, “Effect of NiO Precursor Solution Ageing on the Perovskite Film Formation and their Integration as Hole Transport Material for Perovskite Solar Cells”, Journal of Nanoscience and Nanotechnology, 2020, 20 (6), 3710-3717.

Ranjan, R.; Usmani, B.; Pali, S.; Ranjan, S.; Singh, A.*.; Garg, A.*; Gupta, R. K.*; “Role of PC60BM in defect passivation and improving degradation behaviour in planar perovskite solar cells” Solar Energy Mat. and Solar Cells 2020, 207, 110335-110345.

R. Ranjan, B. Usmani, S. Ranjan, H. C. Weerasinghe, A. Singh*, A. Garg* and R. K. Gupta*, “Enhanced Efficiency and Thermal Stability of Mesoscopic Perovskite Solar Cells by Adding PC70BM Acceptor”, Solar Energy Materials and Solar Cells, 2019, 202, 110130.

Garg, P.; Singh, A.*; “Visible Light Mediated Trifluoromethylation of Enol Acetates Using Trifluoroacetic Anhydride“ Asian J. Org. Chem., 2019, 8, 849-852.

Sathiyan, G.; Bhuvaneshwari, B.; Ranjan, S.; Chatterjee, S.; Sen, P.; Garg, A.*; Gupta, R. K.*; Singh, A.* “A novel star shaped triazine-triphenylamine based fluorescent chemosensor for the selective detection of picric acid” Mat. Today Chem., 2019, 12, 178-186.

Sathiyan, G.; Ranjan, R.; Ranjan, S.; Garg, A.*; Gupta, R. K.*; Singh, A.*Dicyanovinylene and Thiazolo[5,4-d]thiazole Core Containing D–A–D Type Hole-Transporting Materials for Spiro-OMeTAD-Free Perovskite Solar Cell Applications with Superior Atmospheric Stability” ACS Appl. Energy Mater. 2019, 2, 7609-7618.

Sathiyan, G.; Chatterjee, S.; Sen, P.; Garg, A.*; Gupta, R. K.*; Singh, A.* “Thiazolothiazole‐Based Fluorescence Probe towards Detection of Copper and Iron Ions through Formation of Radical Cations” Chemistry Select 2019, 4, 11718-11725.

Ranjan, R.; Bajpai, A.; Singh, A.; Singh, A.*; Garg, A.*; Gupta, R. K.* “Effect of tantalum doping in TiO2 compact layer on the performance of planar Spiro-OMeTAD free perovskite solar cells” J. Mat. Chem. A, 2018, 6, 1037-1047.

Prakash, J.; Singh, A.; Sathiyan, G.; Ranjan, R.; Singh, A.*; Garg, A.*; Gupta, R. K.* “Progress in tailoring perovskite based solar cells through compositional engineering: Materials properties, photovoltaic performance and critical issues” Mat. Today Energy, 2018, 9, 440-486.

Garg, P; Singh, A.* “Unmasking Dipole Character of Acyl Ketene Dithioacetals via A Cascade Reaction with Arynes: Synthesis of Benzo[b]thiophenes” Org. Lett. 2018, 20, 1320.

Tiwari, V., Singh, A.* „Expeditious Conversion of Iodoallenes to Iodoenals Mediated by Sodium Azide and Iodine“ Chemistry Select, 2018, 3, 6018-6021.

Panday, P.; Garg, P.; Singh, A.* “Manganese-Dioxide-Catalyzed Trifluoromethylation and Azidation of Styrenyl Olefins via Radical Intermediates” Asian. J. Org. Chem. 2018, 7, 111.

Jadhav, S. D.; Singh, A.* “Oxidative Annulations Involving DMSO and Formamide: K2S2O8 Mediated Syntheses of Quinolines and Pyrimidines” Org. Lett., 2017, 19, 5673.

Garg, P.; Jadhav, S. D.; Singh, A.* “Oxidation State Dichotomy in Copper-Catalyzed Intramolecular Cyclization of α-Diazoanilides: An Integrated Synthetic Platform for Oxindoles and Isatins Enabled by Oxygenase-Type Reactivity” Asian. J. Org. Chem. 2017, 6, 1019.

Bakshi, D.; Singh, A.* “Direct Csp2–H enolization: an allenoate alkylation cascade toward the assembly of multi-substituted furans” Org. Biomol. Chem. 2017, 15, 3175.

Jadhav, S. D.; Bakshi, D.; Singh, A.* “Synthesis of Unsymmetrical α,α-Diarylacetates” J. Org. Chem., 2016, 81, 522.

Jadhav, S. D.; Bakshi, D.; Singh, A.* “Visible Light Mediated Organocatalytic Activation of Ethyl Bromofluoroacetate: Coupling with Indoles and Anilines” J. Org. Chem. 2015, 80, 10187.

Bakshi, D.; Singh, A.* “Transition-Metal-Free Synthesis of Nitrogen Containing Heterocycles With Fully Substituted N-fused Pyrrole Rings” Asian J. Org. Chem. 2016, 5, 70.