Nitrosation of α, α'-dianions produced from ketones using a couple of bases was carried out with tert-butyl nitrite(tert-BuONO) in ether, and then two regioisomers of oximes(but not acetone)were obtained simultaneously. The ratio of these regioisomers was remarkably reversed by the addition of hexamethylphosphoric triamide(HMPA).
large-scale synthesis to cover all of the material requirements of the final active pharmaceutical ingredient, gilteritinib, for early stage development thereof. To address these issues urgently and determine a scalable synthetic route to the key compound, a thorough process investigation was undertaken, and the efficient second route starting from methyl 3-oxopentanoate was successfully discovered. Highlights