Hy. Kim et al., Relative reactivity of anti- and syn-oximino carbonates and carbamates of 5-pyridylacetic acid esters, ORG LETT, 3(14), 2001, pp. 2137-2140
[GRAPHICS]
anti-Oximes of 2-pyridylacetic acid esters are rapidly transformed to pyrid
ine-2-carbonitrile under a variety of conditions while syn-oximes bearing t
ert-butyl esters can be conveniently deprotected to the corresponding carbo
xylic acid with subsequent fragmentation to the nitrile.