Cn. O'Callaghan et Tbh. Mcmurry, Conversion by hydrazinolysis of tetrahydropyridine ester derivatives into 1-ammoniotetrahydropyridine 6-oxide derivatives, J CHEM R-S, (9), 1998, pp. 491-491A
The reaction of alkyl 4-amino-2,6-diaryl 1,2,3,6-tetrahydropyridine-5-carbo
xylates with hydrazine hydrate results in the formation of 1 -ammonio-2-ary
l-4-imino-1,2,3,4 tetrahydropyridine 6-oxides, with elimination of one aryl
group and the ester alkoxy group.