Oxidative Annulation of Anilides with Internal Alkynes Using an (Electron‐Deficient η
<sup>5</sup>
‐Cyclopentadienyl)Rhodium(III) Catalyst Under Ambient Conditions
作者:Yuki Hoshino、Yu Shibata、Ken Tanaka
DOI:10.1002/adsc.201300884
日期:2014.5.5
A dinuclear (electron‐deficient η5‐cyclopentadienyl)rhodium(III) complex was synthesized on a preparative scale via the rhodium‐catalyzed cross [2+2+1] cyclotrimerization of silylacetylenes and two alkynyl esters, leading to substituted silylfulvenes, followed by reductive complexation with rhodium(III) chloride in ethanol. The thus obtained dinuclear (electron‐deficient η5‐cyclopentadienyl)rhodium(III)
的双核(缺电子η 5 -环戊二烯基)合铑(III)络合物在制备规模合成通过铑催化的交叉[2 + 2 + 1] silylacetylenes和两个炔基酯的环化三聚,导致取代silylfulvenes,随后与氯化铑(III)在乙醇中的还原络合。将如此得到的双核(缺电子η 5 -环戊二烯基)合铑(III)络合物是用于与在环境条件下内部炔烃(在空气下室温)酰替苯胺的氧化环的高度活性的预催化剂。使用这种缺乏电子的铑(III)配合物,可以观察到在富电子的基底上优于无电子的基底进行环化的偏好。