The reactivity of 3,5-dimethylidene-2,2,6,6-tetramethyl-4-oxopiperidin-1-oxyl and its diamagneticN-methyl analog in nucleophilic addition of amines and diels—Alder dimerization
作者:A. B. Shapiro、O. Ya. Borbulevich、S. V. Koroteev、A. D. Malievskii
DOI:10.1007/bf02496333
日期:2000.10
e was shown by the kinetic method to be less reactive than 3,5-dimethylidene-2,2,6,6-tetramethyl-4-oxopiperidin-1-oxyl in the nucleophilic addition of secondary amines and Diels—Alder dimerization. According to the quantum-chemical AM1 calculations, this is due to the difference in the structures of the activated complexes (in the reactions with amines) and to the “press” effect created by theN-methyl
Possible use of 1,2,2,6,6-pentamethyl-3,5-dimethylene-4-piperidone in the synthesis of saturated heterocycles
作者:A. B. Shapiro、A. M. Belostotskii
DOI:10.1007/bf00958055
日期:1989.3
Nucleophilic addition to 1,2,2,6,6-pentamethyl-3,5-dimethylene-4-piperidone
作者:A. M. Belostotskii、A. B. Shapiro
DOI:10.1007/bf00486915
日期:1987.6
Polysubstituted 4-piperidones and 4-piperidols: Synthesis and spatial configuration
作者:A. M. Belostotskii、A. B. Shapiro
DOI:10.1007/bf00965443
日期:1991.2
Triacetonamine was used to synthesize a series of highly substituted 4-piperidones and 4-piperidols. The spatial configuration of these compounds was determined. The anionoid addition to the carbonyl group of these piperidones proceeds through highly stereoselective equatorial attack. The position of the chair-chair-twist conformational equilibrium was determined for the polysubstituted 4-piperidols.