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.
Intramolecular Ar−O−Ar Bond Formation in Calixarenes
作者:Kasim Agbaria、Silvio E. Biali
DOI:10.1021/jo0103468
日期:2001.8.1
are not those connected by the spiro bond in the starting material. Methylation of the phenolic hydroxyl groups of 11d with methyl p-toluenesulfonate/K(2)CO(3) or dimethylsulfate/base afforded its dimethyl and tetramethyl ether derivatives. The parent xanthone calix[6]arene derivative 17b was prepared by O-methylation of the phenol groups followed by CrO(3) oxidation of the xanthene methylene group
Conformational isomerism of calix[6]arenes: isolation of two conformational isomers of the 1,2-bis(p-tert-butylbenzyl) ether of p-tert-butylcalix[6]arene
作者:Placido Neri、Concetta Rocco、Grazia M. L. Consoli、Mario Piattelli
DOI:10.1021/jo00076a002
日期:1993.11
Two conformational isomers of the 1,2-bis-(p-tert-butylbenzyl) ether of p-tert-butylcalix[6]arene have been isolated by chromatography, and their conformational features have been inferred from NMR spectral evidence, VT-NMR studies, and MM2 molecular mechanics calculations.
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.