Shapiro reaction in the series of piperidine derivatives. Synthesis of 3-hydroxy-1,2,3,6-tetrahydropyridines

Article abstract of DOI:10.1007/BF01169248

It is shown that the reaction of tosylhydrazones of 3-hydroxypiperidin-4-ones with bases, depending on the nature of the latter, results in a rearrangement with a narrowing of the heterocycle and formation of acetylpyrrolidines, or in the formation of 3-h