The 4‐aryl‐1,4‐dihydropyrazines were prepared via the cyclization of N,N‐bisalkylated anilines with ammonium acetate. These reactions were aided by improvements in the synthesis of N,N‐bisalkylated anilines which were alkylated with anilines using ethyl 2‐diazo acetoacetate in a reaction catalyzed by rhodium acetate in the absence of oxygen. A possible mechanistic route is postulated on the basis of
通过将N,N-双烷基化苯胺与乙酸铵环化来制备4-芳基-1,4-二氢吡嗪。这些反应得益于N,N-双烷基化苯胺的合成的改进,N2-N-双烷基化苯胺在无氧乙酸铑的催化下,使用乙酰丙酮-2-重氮乙酯与苯胺烷基化。推测可能的机理路线是基于N烷基化中间体的分离,该中间体经1 H NMR数据和X射线衍射确定为N芳基草酸酯。
Synthesis of Dicarboxylic Acid Amides and Diamides on the Basis of [4-(4-Methoxyphenyl)tetrahydro-2H-pyran-4-yl]methanamine
作者:A. A. Aghekyan、G. G. Mkryan、R. E. Muradyan、A. E. Tumajyan
DOI:10.1134/s1070428018060106
日期:2018.6
ethyl N-[4-(4-methoxyphenyl)tetrahydro-2H-pyran-4-yl]methyl}oxamate prepared from [4-(4-methoxyphenyl)tetrahydro-2H-pyran-4-yl]methanamine and diethyl oxalate afforded the corresponding N,N'-disubstituted oxamides. N-Aryloxamides were synthesized by the reaction of [4-(4-methoxyphenyl)tetrahydro-2H-pyran-4-yl]methanamine with ethyl N-aryloxamates. The condensation of N-[4-(4-methoxyphenyl)tetrah