Staudinger Reaction of Schiff Bases of Acetylthiophene and Acetylpyridine with Ketenes. Diastereoselective Synthesis of 4-Heterosubstituted β-Lactams and their Conversion to β-Thiolactams
摘要:
Arylimines of 2-acetylthiophene and 2-, 3-, and 4-acetylpyridines react with ketenes yielding 4-heterosubstituted beta-lactams. Reactions of imines with ketenes were proved to be diastereoselective. The stereochemistry of the products was confirmed by X-ray analysis. beta-Lactams treated with Lawesson's reagent gave beta-thiolactams.