Kröhnke condensation of several cycloimmonium salts with p-dimethylaminobenzaldhyde has been studied. X-Ray diffraction, IR and Raman spectra, 1H-and 13C-NMR and UV spectra of the products are discussed, being compared, when necessary, with the starting pyridinium salts. All compounds showed the Z configuration, corresponding to the more stable structure, except one, in which steric factors were predominant
作者:A. M. Shestopalov、V. P. Litvinov、L. A. Rodinovskaya、Yu. A. Sharanin
DOI:10.1055/s-1991-26477
日期:——
trans-4,5-Substituted 1,4,5,6-tetrahydropyridine-2-(olates)thiolates are prepared either from pyridinium salts and cyanoacetic acid derivatives or from pyridinium salts, aromatic aldehydes and ethyl cyanoacetate or cyanoacetamide in the presence of a base.
Reactions of 1-[(methylthio)thiocarbonylmethyl]pyridiniumiodide with hydrazine derivatives and o-aminophenols gave 1-heteroarylmethylpyridiniumsalts derived from 1,3,4-thiadiazole and 1,3-benzazole, under mild conditions.