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。
Synthesis of Isochromene and Related Derivatives by Rhodium-Catalyzed Oxidative Coupling of Benzyl and Allyl Alcohols with Alkynes
The straightforward synthesis of isochromene derivatives and related cyclic ethers is achieved by the rhodium-catalyzedoxidativecoupling of α,α-disubstituted benzyl and allyl alcohols with alkynes. The hydroxy groups effectively act as the key function for the regioselective C–H bond cleavage.