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.
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。
Palladium mediated domino reaction: synthesis of isochromenes under aqueous medium
作者:Lavisha Punia、Karu Ramesh、Gedu Satyanarayana
DOI:10.1039/c9ra08792c
日期:——
Isochromenes have been synthesized using palladium-catalyzed C–C and C–O bond forming reactions starting from ortho-bromo tertiary benzylicalcohols and internal acetylenes. Notably, this domino process is feasible by using the green solvent, water. The protocol exhibited a broad substrate scope and afforded various isochromenes.