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.
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。