Tetrahedron p. 8907 - 8916 (1991)
Update date:2022-08-03
Topics:
Clerici, Francesca
Folpini, Elena
Gelmi, Maria L.
Pocar, Donato
The reaction of 4-alkylidene-5(4H)-oxazolones 2a-e with ethyl 3-oxo-4-triphenyphosphoranylidene-butyrate 1 affords dihydrobenzoxazoles 3a-c and the diastereoisomeric 1,3-cyclohexanedione ylides 4a-e and 5a-e. 3a is oxidized to the corresponding benzoxazol
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