Electronic Supplementary Information Selective amidation by a photocatalyzed umpolung reaction Debasish Ghosh, a Rajesh Nandi, a Saikat Khamarui, b Sukla Ghosh, c and Dilip K. Maiti* a a Department of Chemistry, University of Calcutta, 92, A. P. C. Road, Kolkata-700009, India b Department of Chemistry, Government General Degree College at Kalna-1, Burdwan-713405 c Department of Chemistry, Women's College, Calcutta, P-29, Kshirode Vidyavinode Avenue, Kolkata -700003 *Corresponding author. Fax: 91-33-2351 9755, Tel: 91-33-2350 1014; e-mail: dkmchem@caluniv.ac.in Table of Contents Serial No. Content Page 1. Materials and methods S-2 2. General procedure for the synthesis of -ketoamides (4a-l, 5a-n) S-2 3. General procedure for the synthesis of oxalamides (8a-f) S-2 4. Characterization data of the synthesized -ketoamides (4a-l) S-2 5. Characterization data of the synthesized chiral -ketoamides (5a-n) S-5 6. Characterization data of the synthesized oxalamides (8a-f) S-8 7. Characterization data of controlled experiments S-9 8. Isolation and detection of byproduct S-11 9. References S-12 10. 1 H and 13 C-NMR spectra of synthesized -ketoamides (4a-l, 5a-n),oxalamides (8a-f), and compounds of control experiments S-13 11. Screening of visible light wave lengths towards -ketoamides S-48 12. Crystal structure of compound 4e (CCDC 1862562) S-49 13. Crystal data summary of compound 4e (CCDC 1862562) S-49 14. Mass spectra data S-50 Electronic Supplementary Material (ESI) for Chemical Communications. This journal is © The Royal Society of Chemistry 2019