Reactive Iron Carbonyl Reagents via Reaction of Metal Alkoxides with Fe(CO)<sub>5</sub> or Fe<sub>2</sub>(CO)<sub>9</sub>: Synthesis of Cyclobutenediones via Double Carbonylation of Alkynes
作者:Mallesh Beesu、Mariappan Periasamy
DOI:10.1021/jo102104a
日期:2011.1.21
Alkoxy bases such as t-BuOK react with Fe(CO)5 to give reactive iron carbonyl intermediates that in turn react with alkynes at 70 °C in THF to give 1,2-cyclobutenediones in 70−93% yields after CuCl2·2H2O oxidation. A novel 1,2-diacyloxyferrole derivative was isolated in the reaction of diphenylacetylene with Fe(CO)5/t-BuOK in the presence of acetyl chloride in contrast to the formation of a 1,4-diacyloxyferrole
烷氧基碱(例如t -BuOK)与Fe(CO)5反应,生成反应性羰基铁中间体,然后在THF中与炔烃在70°C下反应,在CuCl 2 ·2H后以70-93%的产率生成1,2-环丁烯二酮2 O氧化。在二苯基乙炔与Fe(CO)5 / t- BuOK在乙酰氯存在下的反应中,分离了一种新型的1,2-二酰氧基铁络合物,与使用Fe的反应中形成的1,4-二酰氧基铁络合物形成了对比(CO)5 / Me 3 NO。铁2(CO)9 /吨-BuOK试剂系统还可以在类似的反应条件下,以63-90%的产率将炔烃转化为相应的环丁二烯。