Lien vers Pubmed [PMID] – 26018762
J. Org. Chem. 2015 Jun;80(12):6509-14
The two-step synthesis of spirocyclic pyrazolone derivatives from simple and commercially available reagents is described. The unusual reaction of 1,3-dicarbonyls with hydrazines and an iodine-mediated oxidative carbon-nitrogen bond formation, joined in a two-step, one-pot reaction, allows the straightforward synthesis of these spirocycles.