Synthesis of Substituted Nicotinamides from Enamines Derived from N,N-Dimethylformamide Dimethyl Acetal
作者:Fathi A. Abu-Shanab、Fawzy M. Aly、Basil J. Wakefield
DOI:10.1055/s-1995-4039
日期:1995.8
Reactions of 1,3-dicarbonyl compounds with N,N-dimethylformamide dimethyl acetal followed by malonamide in the presence of sodium hydride give 5,6-disubstituted 1,2-dihydro-2-oxopyridine-3-carboxamides 3a-c, whereas reactions of the intermediate enamines with cyanothioacetamide or cyanoacetamide in the presence of piperidine give 4,5-disubstituted 1,2-dihydro-2-thioxopyridine-3-carboxamides 6a-c and 1,2-dihydro-2-oxopyridine-3-carboxamides 6d-h.
1,3-二羰基化合物与N,N-二甲基甲酰胺二甲基缩醛反应,然后在氢化钠存在下与丙二酰胺反应,生成5,6-二取代的1,2-二氢-2-氧代吡啶-3-甲酰胺3a-c;而中间体烯丙胺与氰基硫代乙酰胺或氰基乙酰胺在哌啶存在下反应,生成4,5-二取代的1,2-二氢-2-硫代吡啶-3-甲酰胺6a-c和1,2-二氢-2-氧代吡啶-3-甲酰胺6d-h。