Intermolecular cyclotrimerization of haloketoalkynes and internal alkynes: facile access to arenes and phthalides
作者:A. P. Silvestri、J. S. Oakdale
DOI:10.1039/d0cc05706a
日期:——
arenes in a single step. The highest regioselectivities (96% single isomer) were observed when employing 2° and 3°-halopropiolamides. A mechanistic hypothesis accounting for this selectivity is proposed. Notably, by using 1,4-butynediol as the internal alkyne, in situ lactonization following [2+2+2]-cycloaddition generates therapeutically-relevant phthalide pharmacophores directly.
据报道,在3-卤代丙酰胺和对称内部炔烃之间具有高度的化学和区域选择性环(共)三聚作用。该反应由CpRuCl(COD)催化,在空气中,环境温度下于乙醇中进行,无需其他预防措施。碘代,溴代和氯代丙酰胺,酯和酮是可行的偶合伴侣,相对于内部炔烃,化学计量比为2:1,一步即可得到完全取代的芳烃。当使用2°和3°-卤代丙酰胺时,观察到最高的区域选择性(96%的单一异构体)。提出了解释这种选择性的机械假设。显着地,通过使用1,4-丁炔二醇作为内部炔烃,在[2 + 2 + 2]-环加成之后的原位内酯化直接产生与治疗相关的邻苯二甲酸酯药效团。