Ring enlargement of N-acylaziridines followed by nickel peroxide oxidation provides a variety of 2,4-disubstituted-1,3-oxazoles suitable for bis- and tris-oxazole synthesis.
Preparation of new 2,4-disubstituted oxazoles from N-acylaziridines
作者:Frank W. Eastwood、Patrick Perlmutter、Qi Yang
DOI:10.1039/a604091h
日期:——
The efficiency of the ring enlargement of 2-substituted
N-acylaziridines to dihydrooxazoles followed by nickel peroxide
oxidation to give 2,4-disubstituted oxazoles as a synthetic route is
examined. Sodium iodide-promoted ring enlargements work well for
N-acylaziridines bearing electron-donating 2-substituents. For
N-acylaziridines bearing electron-withdrawing 2-substituents,
the best results are obtained using acid-promoted
rearrangement.