M. Kacan et al., INTRAMOLECULAR OXIDATIVE CYCLIZATION OF 1-(4-HYDROXYARYL)-2-KETOXIMES4-HOARCH2C(=NOH)R WITH PHENYLIODINE(III) BIS(TRIFLUOROACETATE), Journal of the Chemical Society. Perkin transactions. I, (15), 1993, pp. 1771-1776
Reaction of 1-(4-hydroxyaryl)-2-ketoximes, 4-HOArCH2C(=NOH)R, with phe
nyliodine(III) bis(trifluoroacetate) in acetonitrile at 0-degrees-C re
sults in smooth intramolecular oxidative cyclisation and formation of
1-oxa-2-azaspiro[4.5]deca-2,6,9-trien-8-ones in good to excellent yiel
d. Attempted application of the procedure to 1-(2-hydroxyphenyl)propan
-2-one oxime resulted in formation of the [4 + 2] dimer of the initial
ly formed spiroisoxazoline.