prepared in only three steps from commercially available pyrimidines. The key step of this short sequence is a [4 + 2]/retro-[4 + 2] cycloaddition between a pyrimidine and an ynamide, which constitutes the first examples of ynamides behaving as electron-rich dienophiles in [4 + 2] cycloaddition reactions. In addition, running the ihDA/rDA reaction in continuous mode in superheated toluene, to overcome
从生命科学到催化,4-
氨基吡啶通常是
化学工业中有价值的支架。我们在这里报告了结构多样的多环稠合和螺-4-
氨基吡啶的集合,它们仅需三步即可从市售
嘧啶中制备。此短序列的关键步骤是
嘧啶和乙酰胺之间的[4 + 2] /复古-[4 + 2]环加成,这构成了乙酰胺中的首个实例,在[4 + 2]环加成中表现为富电子的亲二烯体。反应。此外,与间歇模式相比,在过热的
甲苯中以连续模式运行ih
DA / r
DA反应可克服MW反应有限的可扩展性,从而显着提高产量。最后,