Acs. Reddy et al., THE NOVEL METHOD FOR THE SYNTHESIS OF ISOXAZOLO AND PYRAZOLO PYRIDINES USING HYPERVALENT IODINE REAGENT, Synthetic communications, 27(13), 1997, pp. 2217-2222
Hypervalent iodine oxidation of 3-carboxamide-2-oxo / 2-amino pyridine
s 1 and 3 by phenyliodine(III) bis(trifluoroacetate) (PIFA) in DMF/H2O
results in a novel synthesis of isoxazolo and pyrazolo pyridines 2 an
d 4 respectively in 65-80 percent yield.