Reaction of 3-[(alkylsulfanyl)methyl]pentane-2,4-diones with nicotinic hydrazide
作者:Larisa A. Baeva、Radik M. Nugumanov、Rail R. Gataullin、Akhnef А. Fatykhov
DOI:10.1007/s10593-020-02698-1
日期:2020.5
The reaction of 3-[(alkylsulfanyl)methyl]pentane-2,4-diones with nicotinic hydrazide in ethanol as solvent produces 4-[(alkylsulfanyl)- methyl]-substituted 1-(pyridin-3-yl)carbonyl-1H-pyrazoles, whereas 1-acyl-1H-pyrazoles are formed in acetic, propanoic, or pentanoic acidsolution. The reaction in methanol in the presence of ZnCl2 is accompanied by elimination of nicotinic acid and the formation of
3-[(烷基硫烷基)甲基]戊烷-2,4-二酮与烟酰胺在乙醇中的溶剂反应生成4-[(烷基硫烷基)-甲基]-取代的1-(吡啶-3-基)羰基-1 H -吡唑,而1-酰基-1 H-吡唑在乙酸,丙酸或戊酸溶液中形成。在ZnCl 2存在下在甲醇中的反应伴随有烟酸的消除和(烷基硫烷基)甲基取代的1 H-吡唑的形成。