[2+2+2] Cycloadditions of Alkynylynamides - A Total Synthesis of Perlolyrine and the First Total Synthesis of “Isoperlolyrine”
作者:Benjamin Dassonneville、Bernhard Witulski、Heiner Detert
DOI:10.1002/ejoc.201100121
日期:2011.5
The total syntheses of the carboline alkaloids perlolyrine and "isoperlolyrine" are reported. Key-steps of the syntheses are Negishi coupling reactions on alkynylynamides and their metal-catalyzed [2+2+2] cycloadditions with nitriles to form the β- and γ-carboline cores. The choice of the catalyst strongly affects the β/γ ratio. Spectroscopic features of the γ-isomer are distinctly different from those
报道了咔啉生物碱 perlolyrine 和“isoperlolyrine”的全合成。合成的关键步骤是炔基酰胺上的 Negishi 偶联反应及其金属催化的 [2+2+2] 环加成与腈形成 β- 和 γ-咔啉核。催化剂的选择强烈影响β/γ比。γ-异构体的光谱特征明显不同于天然存在的异紫红花碱。