Synthesis of isoxazoles by hypervalent iodine-induced cycloaddition of nitrile oxides to alkynes
作者:Anup M. Jawalekar、Erik Reubsaet、Floris P. J. T. Rutjes、Floris L. van Delft
DOI:10.1039/c0cc04646a
日期:——
Treatment of oximes with hypervalent iodine leads to substituted isoxazoles via rapid formation of nitrile oxides. Reaction with terminal alkynes led to a series of 3,5-disubstituted isoxazoles with complete regioselectivity and high yield, in a procedure mild enough to prepare a range of nucleoside and peptide conjugates. Exceptionally high reactionrates were found for the formation of 3,4,5-trisubstituted