The use of aliphatic aldehydes for the synthesis of 4-alkyl-6-amino- 3,5-dicyanopyridine-2(1H)-thiones
作者:N. G. Frolova、V. K. Zav'yalova、V. P. Litvinov
DOI:10.1007/bf01431320
日期:1996.4
The condensation of aliphatic aldehydes with malononitrile and cyanothioacetamide gives 4-alkyl-2,6-diamino-3,5-dicyano-4H-thiopyrans which recyclize into 4-alkyl-6-amino3,5-dicyanopyridine-2(IH)-thiones. The latter are easily S-alkylated with α-haloacetonitriles and α-haloacetophenones.
脂肪醛与丙二腈和氰基硫代乙酰胺缩合得到 4-烷基-2,6-二氨基-3,5-二氰基-4H-噻喃,再循环生成 4-烷基-6-氨基3,5-二氰基吡啶-2(IH)-硫酮. 后者很容易被 α-卤代乙腈和 α-卤代苯乙酮 S-烷基化。