Cu(II)-Mediated One-Pot Alkoxide Conjugate Addition/Radical Cyclizations as a Versatile Method to Highly Functionalized Tetrahydrofuran Derivatives
作者:Ullrich Jahn、Dmytro Rudakov
DOI:10.1055/s-2004-822930
日期:——
The synthesis of highly functionalized 3-nitrotetrahydro-furans starting from allylic alcohols and nitroalkenes through an efficient CuCl 2 -mediated tandem anionic/radical process is reported. The one-pot reaction consists of oxa-Michael addition/SET/radical 5-exo-cyclization-ligand transfer. Functionalization of the THF ring is facile and provides diverse substituted derivatives.
Sequential 1,3-Dipolar Cycloadditions in the Synthesis of Bis-Isoxazolo Substituted Piperidinones
作者:Kevin Sheng-Lin Huang、Edwin H. Lee、Marilyn M. Olmstead、Mark J. Kurth
DOI:10.1021/jo991418m
日期:2000.1.1
A strategy for the efficient synthesis of novel bis-isoxazolo substituted piperidinones has been developed. The protocol consists of the Michael addition of an unsaturated alkoxide to beta-nitrostyrene followed by an intramolecular nitrile oxide cycloaddition (INOC) or an intramolecular silyl nitronate olefin cycloaddition (ISOC) to give III. Grignard addition to this isoxazoline intermediate followed