One-pot thermally chemocontrolled double Diels–Alder strategies. A route to [4 + 2] functionalisation/[4 + 2] derivatization of C60
作者:Marios S. Markoulides、Georgios I. Ioannou、Manolis J. Manos、Nikos Chronakis
DOI:10.1039/c3ra23327h
日期:——
The one-pot double DielsâAlder reactions of 3,4-di(methylene)tetrahydrothiophene-1,1-dioxide using temperature as the only chemocontrol element are described. Zn-dust promoted the 1,4-debromination of 3,4-bis(bromomethyl)-2,5-dihydrothiophene-1,1-dioxide in 5-nonanone, under MW conditions, followed by a DielsâAlder reaction, an SO2 extrusion step and a second DielsâAlder reaction. This approach was applied successfully in double [4 + 2] cycloadditions using the same or two different dienophiles to afford the corresponding DielsâAlder products in excellent yields. An elegant and practical method for [4 + 2] functionalisation/[4 + 2] derivatization of C60 was achieved in a one-pot manner via the formation of a new reactive C66 dienic intermediate.
该研究描述了以温度为唯一化学控制元素的 3,4-二(亚甲基)四氢噻吩-1,1-二氧化物的一锅双 DielsâAlder 反应。在 MW 条件下,Zn-dust 促进了 3,4-双(溴甲基)-2,5-二氢噻吩-1,1-二氧化物在 5-壬酮中的 1,4-脱溴反应,随后进行了一个 DielsâAlder 反应、一个 SO2 挤压步骤和第二个 DielsâAlder 反应。这种方法被成功地应用于使用相同或两种不同的二烯烃进行双[4 + 2]环加成反应,以优异的收率得到相应的 DielsâAlder 产物。通过形成一种新的活性 C66 二烯中间体,以一锅法实现了 C60 的[4 + 2]官能化/[4 + 2]衍生化,这是一种优雅而实用的方法。