Oxidative Alkoxycarbonylation of Alkynes by Means of Aryl α-Diimine Palladium(II) Complexes as Catalysts
作者:Michela Beltrani、Carla Carfagna、Barbara Milani、Raffaella Mancuso、Bartolo Gabriele、Francesco Fini
DOI:10.1002/adsc.201600521
日期:2016.10.20
isopropyl alcohol and tert‐butyl alcohol. In addition, aromatic and aliphatic 1,2‐disubstituted alkynes were converted into maleic acid derivatives, together with an acid‐catalyzed isomerization reaction, showing modest to good selectivity and excellent combined yields. In particular 3‐hexyne showed a satisfactory degree of selectivity for the maleic diesters of methanol and benzyl alcohol, obtaining the corresponding
直接使用原位合成的双(2,6-二异丙基)ac萘醌二亚胺三氟甲磺酸钯催化剂可通过温和的反应条件用于末端炔烃的单烷氧基羰基化和1,2-二取代炔烃的双烷氧基羰基化[一氧化碳压力(P CO)= 4 bar,温度= 20°C]。利用低催化剂负载量(低至0.5 mol%),合成了各种丙酸酯,分离率高到极好。最重要的是,该系统不仅对甲醇而且对多种不同的醇(从受阻程度较小的苄醇到受阻最大的障碍醇,例如异丙醇和叔醇)开始都是非常有效的丁醇。此外,芳香族和脂肪族的1,2-二取代炔烃与酸催化的异构化反应一起转化为马来酸衍生物,显示出适中至良好的选择性以及优异的综合收率。特别是3-己炔对甲醇和苄醇的马来酸二酯表现出令人满意的选择性,从而获得了具有良好分离收率的相应产物。