Syntheses of all poasible calix[6]arene derivatives with MeO- and ROCOCH2O- substituents and their metal binding properties
摘要:
It has become possible to synthesize all possible calix[6]arene derivatives with MeO- and ROCOCH(2)O- substituents from corresponding O-methylated calix[6]arenes(2-7). The yields of these reactions were relatively high and the products could be easily purified because of the absence of other regioisomers. They are one mono-, three di-, three tri-, three tetra-, one penta-, and one hexa-EtOCOCH(2)O-substituted products. It was proved that O-methylation products act as useful basic skeletons to design functionalized calix[6]arenes with the desired number of ROCOCH(2)O substituents and the regioselectively-positioned ROCOCH(2)O groups.
Syntheses of All Possible O-Methylation Products Derivable from 5,11,17,23,29,35-Hexa-tert-butylcalix[6]arene-37,38,39,40,41,42-hexol
摘要:
We here report methods for the synthesis of all twelve possible 0-methylation products from 5,11,17,23,29,35-hexa-tert-butylcalix[6]arene-37,38,39,40,41,42-hexol (1): one mono-, three di-, three tri-, three tetra-, one penta-, and one hexamethylated products. The strategies used are (i) direct O-methylation with different 1/K2CO3 ratios, (ii) selective mono-O-methylation of O-alkylation products, (iii) demethylation with TiCl4 or LiI, and (iv) protection-deprotection with a benzyl group or an o- or m-xylenyl group. We believe that these O-methylation products are useful as basic skeletons to design functionalized calix[6]arenes with the desired number of substituents and regioselectively-positioned functional groups.
Synthesis and conformational properties of calix[6]arenes bridged on the lower rim: self-anchored rotaxanes
作者:Suseela Kanamathareddy、C. David Gutsche
DOI:10.1021/ja00068a014
日期:1993.7
p-tert-butylcalix[6]arene can be converted to transannularly bridged esters by treatment with diacid chlorides ranging from succinoyl to suberoyl and including terephthaloyl. The parent compounds p-tert-butylcalx[6]arene and p-H-calix[6]arene can also be transannularly bridged by treatment with bis-halomethylaryl compounds by using KOSiMe 3 as the base. Methylation of the resulting calix[6]arenes containing
对叔丁基杯[6]芳烃的 1,4-二-对甲苯基醚可以通过用范围从琥珀酰基到辛二酰基(包括对苯二酰基)的二酰氯处理而转化为环环桥连酯。母体化合物对叔丁基钙[6]芳烃和pH-杯[6]芳烃也可以通过使用KOSiMe 3 作为碱用双卤代甲基芳基化合物处理而跨环桥连。所得含有1,4-CH 2 ArCH 2 桥连部分的杯[6]芳烃的甲基化产生相应的四甲基醚。当Ar为蒽时,原料的构象保持不变,但当Ar为亚苯基时,构象发生变化;当 Ar 是 duryl 时,得到构象异构体的混合物。1 H NMR 分析和分子模型研究表明,当 Ar 为苯基或双二甲苯时,该系统能够进行构象转变,其中桥接部分穿过大环的环以产生自锚定轮烷。采用一种新的方案来表示杯芳烃构象,这被设计为 (u,u,u,u,u,u) 到 (u,u,d,d,d,u) 的转换。与 (u,u,u,u,u,u) 构象相比,构象变化的明显驱动力是 (u,u,d,d
Otsuka Hideyuki, Araki Koji, Shinkai Seiji, J. Org. Chem, 59 (1994) N 6, S 1542-1547
作者:Otsuka Hideyuki, Araki Koji, Shinkai Seiji
DOI:——
日期:——
Syntheses of All Possible O-Methylation Products Derivable from 5,11,17,23,29,35-Hexa-tert-butylcalix[6]arene-37,38,39,40,41,42-hexol
作者:Hideyuki Otsuka、Koji Araki、Seiji Shinkai
DOI:10.1021/jo00085a048
日期:1994.3
We here report methods for the synthesis of all twelve possible 0-methylation products from 5,11,17,23,29,35-hexa-tert-butylcalix[6]arene-37,38,39,40,41,42-hexol (1): one mono-, three di-, three tri-, three tetra-, one penta-, and one hexamethylated products. The strategies used are (i) direct O-methylation with different 1/K2CO3 ratios, (ii) selective mono-O-methylation of O-alkylation products, (iii) demethylation with TiCl4 or LiI, and (iv) protection-deprotection with a benzyl group or an o- or m-xylenyl group. We believe that these O-methylation products are useful as basic skeletons to design functionalized calix[6]arenes with the desired number of substituents and regioselectively-positioned functional groups.
Syntheses of all poasible calix[6]arene derivatives with MeO- and ROCOCH2O- substituents and their metal binding properties
作者:Hideyuki Otsuka、Koji Araki、Seiji Shinkai
DOI:10.1016/0040-4020(95)00466-l
日期:1995.8
It has become possible to synthesize all possible calix[6]arene derivatives with MeO- and ROCOCH(2)O- substituents from corresponding O-methylated calix[6]arenes(2-7). The yields of these reactions were relatively high and the products could be easily purified because of the absence of other regioisomers. They are one mono-, three di-, three tri-, three tetra-, one penta-, and one hexa-EtOCOCH(2)O-substituted products. It was proved that O-methylation products act as useful basic skeletons to design functionalized calix[6]arenes with the desired number of ROCOCH(2)O substituents and the regioselectively-positioned ROCOCH(2)O groups.