“…This Review begins by describing the methods for the preparation of various α-oxoesters, followed by the use of them to synthesize heterocycles in the arrangement of N -, O -, N , O -, N , S -, S -, and S , O -heterocycles in the ring size order of three-, four-, five-, six-, and seven-membered heterocycles. However, there are some review articles about special derivatives of α-oxoesters or similar structures, “arylidene pyruvic acids”, “( E )-2-oxo-3-butenoates”, and “benzoylpyruvates”, but to the best of our knowledge, there are no reviews and book chapters in the field of α-oxoesters in heterocycles synthesis.…”