Highly Selective Synthesis of Pillar[<i>n</i>]arene (<i>n</i> = 5, 6)
作者:Saber Mirzaei、Denan Wang、Sergey V. Lindeman、Camille M. Sem、Rajendra Rathore
DOI:10.1021/acs.orglett.8b02937
日期:2018.10.19
toward the preparation of pillar[n]arenes (n = 5, 6) is reported, based upon a high solvent-dependent selectivity found in the condensation reaction between 1,4-dialkyloxybenzene and paraformaldehyde, involving methanesulfonic acid as catalyst. Pillar[6]arene (P6) is obtained as the major product when using chloroform as solvent, while in dichloromethane pillar[5]arene (P5) is the dominant product. Accordingly
Supramolecular enantiomeric and structural differentiation of amino acid derivatives with achiral pillar[5]arene homologs
作者:Jiecheng Ji、Yizhou Li、Chao Xiao、Guo Cheng、Kui Luo、Qiyong Gong、Dayang Zhou、Jason J. Chruma、Wanhua Wu、Cheng Yang
DOI:10.1039/c9cc08541f
日期:——
Complexation of achiral pillar[5]arenes with chiral amines induced strong circular dichroism (CD) signals. The CD responses differed drastically depending on the nature of the aminoacid guest, and they significantly varied and part of them even inverted, upon increasing the length of the alkyl chains of the pillar[5]arenes guests. Accordingly, this tactic allowed for the unprecedented simultaneous
pillar[5]arene derivatives with alkyl groups of different length were synthesized. The new alkyl-substituted pillar[5]arene derivatives 1,4-bis(ethoxy)pillar[5]arene (C2), 1,4-bis(propoxy)pillar[5]arene (C3), 1,4-bis(butoxy)pillar[5]arene (C4), 1,4-bis(pentyloxy)pillar[5]arene (C5), 1,4-bis(hexyloxy)pillar[5]arene (C6), and 1,4-bis(dodecanoxy)pillar[5]arene (C12) were obtained by Lewis acid-catalyzed condensation
合成了一系列具有不同长度的烷基的支柱[5]芳烃衍生物。新的烷基取代的支柱[5]芳烃衍生物1,4-双(乙氧基)支柱[5]芳烃(C2),1,4-双(丙氧基)支柱[5]芳烃(C3),1,4-双(丁氧基)立柱[5]芳烃(C4),1,4-双(戊氧基)立柱[5]芳烃(C5),1,4-双(己氧基)立柱[5]芳烃(C6)和1,4通过路易斯酸催化二烷氧基苯单体与低聚甲醛的缩合反应制得双(十二烷氧基)支柱[5]芳烃(C12)。通过动态支柱[5]芳烃衍生物的构象特性进行研究11 H NMR测量。当烷基取代基比甲基大时,柱[5]芳烃中酚单元的旋转受到抑制,其构象被固定。随着它们的长度增加,烷基取代基堆积在上下边缘,从而降低了柱[5]芳烃的构象自由度。
Solvent-free synthesis of pillar[6]arenes
作者:S. Santra、D. S. Kopchuk、I. S. Kovalev、G. V. Zyryanov、A. Majee、V. N. Charushin、O. N. Chupakhin
DOI:10.1039/c5gc01505g
日期:——
An efficient solvent-free procedure for the synthesis of pillar[6]arenes has been developed. The procedure involves the solid-state condensation of finely milled 1,4-dialkoxybenzene and paraformaldehyde by grinding in the presence of...
Role of polar solvents for the synthesis of pillar[6]arenes
作者:S. Santra、I. S. Kovalev、D. S. Kopchuk、G. V. Zyryanov、A. Majee、V. N. Charushin、O. N. Chupakhin
DOI:10.1039/c5ra19569a
日期:——
An efficient procedure for the synthesis of pillar[6]arenes has been developed. The procedure involves the condensation of 1,4-dialkoxybenzenes and paraformaldehyde in the presence of a catalytic amount of H2SO4 or BF3·OEt2 in polar solvent media (acetonitrile, ethyl alcohol, acetone etc.). In all cases the interaction afforded pillar[6]arenes in high yields.
已经开发了合成柱[6]芳烃的有效方法。该方法包括在极性溶剂介质(乙腈,乙醇,丙酮等)中,在催化量的H 2 SO 4或BF 3 ·OEt 2存在下,缩合1,4-二烷氧基苯与低聚甲醛。在所有情况下,相互作用均以高收率提供了支柱[6]芳烃。