5-Oxazolones. Part V. Reaction of 4-alkylidene-5(4h)-oxazolones with ethyl 3-oxo-4-triphenylphosphoranylidene-butyrate
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Add time:08/14/2019 Source:sciencedirect.com
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 benzoxazoles 7a,b with iodine.
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