A selective route to the formation of 1-alkoxypyrazino[1,2-a]indole-3-amines through alcohol-initiated dinitrile cyclization, starting from N-(cyanomethyl)indole-2-carbonitriles under basic conditions, was discovered. The resulting compounds were shown to be unstable in solution, and a three-component reaction of the dinitrile, alcohol, and aromatic aldehyde was used to overcome the problem.
通过醇引发的二腈环化,从N-(氰甲基)吲哚-2-腈在碱性条件下开始,发现了形成1-烷氧基吡嗪并[1,2-a]吲哚-3-胺的选择性途径。所得化合物在溶液中显示出不稳定性,使用二腈、醇和芳香醛的三组分反应来克服这个问题。