Title Efficient method for the synthesis of novel methyl 4‑cinnolinecarboxylate Type Article Keywords Heterocyclic compounds, Methyl 4-cinnolinecarboxylate, Multicomponent reaction, Richter cyclization, Synthesis Abstract A new method is designed for the synthesis of some novel methyl 3-aryl/alkyl-4-cinnolinecarboxylate with developed a general Richter cyclization through diazotization strategy of commercially available 2-aryl/alkyl ethynyl aniline and methyl acetate. Most substrates were achieved in moderate to excellent yields in one-pot procedures under mild reaction conditions. Researchers ali akbari (First researcher)Muhammad Saleh Faryabi (Second researcher)Ravi Tomar (Third researcher)