5-Alkoxy and 2-alkoxyoxazoles were shown to react with NN, CN or CO dienophiles to form products that in most cases can be explained to result from a Diels-Alder addition, or by nucleophilic attack of the oxazole on the dienophile, followed by rearrangement. The products are triazolines, imidazolines or oxazolines respectively. Relative reactivitles were established and mechanistic pathways discussed.
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Acknowledgement: We are grateful to NHR spectra. This research was supported Binational Science Foundation.