O-Alkenyl Hydroxylamines: A New Concept for Cyclofunctionalization
摘要:
Treatment of O-homoallylhydroxylamines with palladium(II) and copper(II) in the presence of a base, methanol, and carbon monoxide results in the formation of isooxazolidines. An electron-withdrawing group on the hydroxylamine nitrogen is essential. When carbamate groups are used the products are formed exclusively as their cis isomers.
Synthesis of N,O-Heterocycles by Intramolecular Conjugate Addition of a Hydroxylamine
作者:Roderick Bates、Robert Snell、SusAnn Winbush
DOI:10.1055/s-2008-1072650
日期:——
Isoxazolidines and tetrahydro-1,2-oxazines were produced by a tandem deprotection-intramolecular Michael addition of hydroxylamines. For tetrahydrooxazine formation, high stereoselectivity was observed, even when a quaternary centre was formed.