The Oxidative Annulation of Tertiary Benzyl Alcohols with Internal Alkynes using an (Electron‐Deficient η
<sup>5</sup>
‐Cyclopenta‐ dienyl)Rhodium(III) Catalyst under Ambient Conditions
It has been established that a dinuclear (electron‐deficient η5‐cyclopentadienyl)rhodium(III) complex catalyzes the oxidative annulation of tertiary benzyl alcohols with internal alkynes via sp2CH/OHfunctionalization under ambient conditions (at room temperature under air) to give substituted isochromenes in good yields. The preference for annulation across electron‐rich substrates over electron‐deficient
已经确定的是双核(缺电子的η 5 -环戊二烯基)合铑(III)络合物催化与内部炔烃叔苄醇类的氧化环化通过SP 2 ç H / O ħ官能在环境条件下(室温下于空气中)以高收率得到取代的异戊二烯。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比缺乏电子的基底更倾向于环化。
Ruthenium(II)-Catalyzed Synthesis of Isochromenes by CH Activation with Weakly Coordinating Aliphatic Hydroxyl Groups
作者:Sachiyo Nakanowatari、Lutz Ackermann
DOI:10.1002/chem.201400161
日期:2014.4.25
Cationic ruthenium(II) complexes have been employed for the highly effective oxidative annulation of alkynes with benzyl alcohols to deliver diversely decorated isochromenes. The hydroxyl‐directed CH/OH functionalization process proceeded efficiently under an atmosphere of air. Detailed mechanistic studies were indicative of a kinetically relevant CH metalation.
阳离子钌(II)配合物已被用于炔烃与苄醇的高效氧化环合反应,以提供装饰多样化的异色酮。羟基定向Ç H / O ħ官能化过程的空气的气氛下有效地进行。详细机理研究都表示动力学相关的C ^ h金属化。