作者:Mark McLaughlin、Rafat M. Mohareb、Henry Rapoport
DOI:10.1021/jo026257s
日期:2003.1.1
co-reactants. Thus, it is possible to easily prepare a diverse array of substituted heterocyclic compounds in good yield. The requisite alpha-aminonitriles were synthesized either from amino acids or by phase-transfer alkylation of a glycine anion equivalent. The unstable free 5-aminoimidazoles were normally protected in situ to provide derivatives (methyl imidates or N,N-dimethylamidines) that were amenable
研究了由α-氨基腈制备O-甲基亚氨酸盐,然后与伯胺共环化以生成4-取代的5-氨基咪唑。已经发现,弱酸性对甲苯磺酸吡啶鎓吡啶鎓盐有效地催化了反应顺序的每个阶段:(a)O-甲基亚氨酸酯的形成,(b)它们与多种伯胺的共环化,以及(c)某些所得杂环的衍生化。发达的反应条件可以耐受多种α-氨基腈和伯胺共反应物。因此,可以容易地以高收率制备各种各样的取代的杂环化合物。必需的α-氨基腈可以从氨基酸合成,也可以通过甘氨酸阴离子当量的相转移烷基化来合成。