Remote Functionalization of C<sub>60</sub> with Enantiomerically Pure <i>cyclo</i>-[2]-Malonate Tethers Bearing C12 and C14 Spacers: Synthetic Access to Bisadducts of C<sub>60</sub> with the Inherently Chiral trans-3 Addition Pattern
作者:Maria Riala、Nikos Chronakis
DOI:10.1021/jo4013173
日期:2013.8.2
cyclo-[2]-malonate tethers that were separated by column chromatography in optically pure form. The bismalonates (−)-4b and (−)-9b proved to be excellent tethers for the regioselective Bingel functionalization of C60, furnishing in a regioselective manner the corresponding f,sC and f,sA trans-3 bisadducts with low diastereoselectivity but in very good to excellent total yields. In both cases, the formed trans-3 bisadducts
在本文中,我们描述了两种带有掩蔽为异亚丙基缩醛基的1,2-二醇部分和分别由12和14个碳原子组成的长烷基链的光学纯二醇的合成。所开发的合成方法为合成具有长烷基链的光学纯二醇提供了一种通用方法。使二元醇(-)- 4和(-)- 9与丙二酰二氯进行缩合反应,得到两条环-[2]-丙二酸酯系链,通过柱色谱法分离得到光学纯净的形式。bismalonates(-)- 4b和(-)- 9b被证明是C 60区域选择性Bingel官能化的优良系链,以区域选择性方式提供相应的f,s C和f,s A反式三双加合物,非对映选择性低,但总收率非常好。在这两种情况下,通过简单的柱色谱法以纯净形式分离形成的反式3双加合物,并进行了充分表征。合成的反式3双加合物的成功缩醛脱保护反应,定量得到了相应的多元醇,它们代表了带有二醇部分的新型手性富勒烯化合物。