5-Oxazolones. Part V. Reaction of 4-alkylidene-5(4H)-oxazolones with ethyl 3-oxo-4-triphenylphosphoranylidene-butyrate
- F. Clerici
- E. Folpini
- M.L. Gelmi
- D. Pocar
Publication date
January 1991
DOI Publisher
Elsevier BV ISSN
0040-4020 Citation count (estimate)
4Abstract
The reaction of 4-alkylidene-5(4H)-oxazolones 2a-e with ethyl 3-oxo-4-triphenylphosphoranylidene-butyrate 1 affords dihydrobenzoxazoles 3a-c and the diastereoisomeric 1,3-cyclohexanedione ylides 4a-e and 5a-e. 3a is oxidized to the corresponding benzoxazoles 7a,b with iodine
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