Ring Chain Transformations; X:<sup>1</sup>Synthesis of Condensed (ω -Aminoalkyl)imidazoles by Ring Chain Transformation
作者:Jörg Bohrisch、Michael Pätzel、Jürgen Liebscher、Gerhard Maas
DOI:10.1055/s-1993-25897
日期:——
2-Aminoazaheterocycles 1 react with lactam acetals (2,2-diethoxy-1-methylpyrrolidine, -1-methylpiperidine and -hexahydro-1-methyl-1H-azepine, 2) affording 2-lactamimino azaheterocycles 3. Reaction of the latter with CH-acidic methyl halides 4 allows a ring chain transformation via N-alkylation products 5 resulting in novel 2-[(Ï-(methylammonio)alkyl]imidazo[2,1-b]thiazole, -[1,2-a]pyridine and -[1,2-a]pyrimidine halides 7 and the corresponding 2-[Ï-(methylamino)alkyl] compounds 8.
2-氨基氮杂环 1 与内酰胺缩醛(2,2-二乙氧基-1-甲基吡咯烷、-1-甲基哌啶和-六氢-1-甲基-1H-氮杂环,2)反应,得到 2-内酰胺基氮杂环 3. 后者与 CH 反应-酸性卤代甲烷 4 允许通过 N-烷基化产物 5 进行环链转化,从而产生新的2-[(α-(甲基铵基)烷基]咪唑并[2,1-b]噻唑、-[1,2-a]吡啶和-[1,2-a]嘧啶卤化物7和相应的2-[Ï -(甲基氨基)烷基]化合物8。