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.
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。