?-Ketoaldehydes in the synthesis of 6-alkyl-3-cyano-2(1H)-pyridinethiones
摘要:
An efficient synthesis of 6-alkyl-3-cyano-2(1H)-pyridinethiones by the reactions of the sodium salts of beta-ketoaldehydes with cyanothioacetamide was developed. Pyridinethiones undergo selective S-alkylation with haloacetonitriles and haloacetophenones followed by cyclization to the corresponding thieno[2,3-b] pyridines.
?-Ketoaldehydes in the synthesis of 6-alkyl-3-cyano-2(1H)-pyridinethiones
摘要:
An efficient synthesis of 6-alkyl-3-cyano-2(1H)-pyridinethiones by the reactions of the sodium salts of beta-ketoaldehydes with cyanothioacetamide was developed. Pyridinethiones undergo selective S-alkylation with haloacetonitriles and haloacetophenones followed by cyclization to the corresponding thieno[2,3-b] pyridines.
Synthesis of 2-alkyl-2-(3-cyanopyridin-2-ylthio)propionic acids
作者:V. K. Zav’alova、A. A. Zubarev、V. P. Litvinov
DOI:10.1007/s11172-007-0317-4
日期:2007.10
Derivatives of 2-alkyl-2-mercaptopropionic acid were synthesized based on the substituted 3-cyanopyridin-2(1H)-thiones. The synthesis was carried out by the heating of a mixture of thione, alkyl methyl ketone, and chloroform in the presence of a base. The reaction proceeds readily for acetone, whereas alkyl methyl ketones require a prolonged heating in the presence of a phase-transfer catalyst. Methyl