Ring-opening of isoxazolidine nucleus: Competitive formation of α,β-enones and tetrahydro-1,3-oxazines
摘要:
Treatment of isoxazolidine derivatives with methyl iodide, followed by simple heating with aqueous NaOH, gives rise to a competitive formation of alpha,beta-enones and tetahydro-1,3-oxazines. The ring-opening process is controlled by the stereochemistry of H-5 which represents the driving factor of two competitive reaction routes.