Publication

2026

Visible Light Mediated Enantioselective Alkylation Using Deaminative Approach-Access to Unnatural Amino Acids and Peptides Shashank Singh, Altaf Ansari, Shreya Tewari, Diksha Gambhir, and Ravi P. Singh* Org. Lett. 2026, 28 (30): 9621–9627. 

2025

A radical approach towards polarity-reversed para-substitution of electron-deficient arenes Shashank Singh, Arindam Kundu, Claire Empel, René Michael Koenigs* and Ravi P. Singh* Chem. Commun. 2025, 61, 3888-3891.  Article Link.

Photoinduced stereoselective reactions using pyridinium salts as radical precursors  Shashank Singh†, Diksha Gambhir† and Ravi P. Singh* Chem. Commun. 2025, 61, 3436-3446. 

Polar-effect-directed control in site-selectivity of radical substitution enables C-H perfluoroalkylation of coumarins  Shashank Singh and Ravi P. Singh* J. Org. Chem. 2024, 89, 14785–14801.  

Photoinduced Stereoselective Giese Addition on Coumarins Shashank Singh and Ravi P. Singh* Synthesis. 2025, 57, 481-487 .

Photoinduced metal-free trifluoro/perfluoroalkylation of heteroarenes  Shashank Singh and Ravi P. Singh*Org. Biomol. Chem., 2024,Doi :10.1039/D4OB00511B. 

Visible-light Induced Metal-free Selenation of Tryptamines/3-alkyl indoles, Shashank Singh, Kalyan S Naskar, Arindam Kundu, Ravi P. Singh* Synthesis. 2023, 55(21), 3685-3692. 

Visible light induced alkylation of 2-iminochromene Shashank Singh and Ravi P. Singh* Org. Biomol. Chem., 2022,20, 7891-7895. 

Visible-Light-Driven site-selective Alkylation of Benzo Core of Coumarins Krishna N. Tripathi†, Shashank Singh†, Naved Akhtar, Kuntal Manna*, and Ravi P. Singh* Chem. Commun., 2022, 58, 9674-9677 .

Redox activated amines in organophotoinduced alkylation of coumarins Shashank Singh, Krishna N Tripathi and Ravi P. Singh* Org. Biomol. Chem., 2022,20, 5716-5720 .

Stereoselective Synthesis of Spiro-α-methylene-γ-lactams via Chiral Quaternary 3-Aminooxindole Adducts Accessed by Zn-Mediated Allylation of Sulfinyl Ketimines V. U. Bhaskara Rao†, Shashank Singh†, Krishna N. Tripathi , Ravi P. Singh Synthesis 2020; 52(17): 2551-2562 

Coumarin compound and method of preparation"  therof; IOPA No- 202211041300 

Trifluoro/perfluoroalkylated aryl/alkylidene malononitriles and visible light mediated process for synthesis" ; IOPA No- 202311048076