Intramolecular Inverse Electron-Demand [4 + 2] Cycloadditions of Ynamides with Pyrimidines: Scope and Density Functional Theory Insights
作者:Guillaume Duret、Robert Quinlan、Boyang Yin、Rainer E. Martin、Philippe Bisseret、Markus Neuburger、Vincent Gandon、Nicolas Blanchard
DOI:10.1021/acs.joc.6b02986
日期:2017.2.3
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ihDA / rDA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,