S1 Supporting Information Highly efficient Ag(I)-catalyzed regioselective tandem synthesis of diversely substituted Quinoxalines and Benzimidazoles in water Vineeta Rustagi, a Trapti Aggarwal a and Akhilesh K. Verma a* a Synthetic Organic Chemistry Research Laboratory, Department of Chemistry, University of Delhi, Delhi 110007, India. averma@acbr.du.ac.in Contents Page 1. General S2-S2 2. Syntheisof the 2-alkynylaldehydes (1c, 1i, 1m) S2-S4 3. Synthesis of fused quinoxalines (3a-o) S4-S13 4. Synthesis of compound R and T S12-S13 5. Synthesis of fused benzimidazoles (4a-f) S13-S16 6. X-ray crystallographic data S17-S18 7. Refrences S18-S19 8. Copies of 1 H and 13 C NMRs S20-S72 Electronic Supplementary Material (ESI) for Green Chemistry This journal is © The Royal Society of Chemistry 2011