Combination of Calix[4]arenes and Resorcin[4]arenes for the Complexation of Steroids
作者:Irene Higler、Peter Timmerman、Willem Verboom、David N. Reinhoudt
DOI:10.1021/jo960256g
日期:1996.1.1
Receptor molecules with large cavities synthesized by the combination of building blocks that already possess a cavity, viz. calix[4]arenes and resorcin[4]arenes, are described. These receptor molecules are synthesized by reaction of one or two upper rim 1,2-difunctionalized calix[4]arene fragments oriented either endo or exo toward a cavitand unit. The endo:exo ratio depends on the substituents at the 3- and 4-positions of the calix[4]arenes. These novel receptor molecules complex steroids with association constants of (0.9-9.5) x 10(2) M(-1) in CDCl3.
Novel Routes for the Synthesis of Upper Rim Amino and Methoxycarbonyl Functionalized Calix[4]arenes Carrying Other Types of Functional Groups
作者:Peter Timmerman、Willem Verboom、David N. Reinhoudt、Arturo Arduini、Stefania Grandi、Anna R. Sicuri、Andrea Pochini、Rocco Ungaro
DOI:10.1055/s-1994-25435
日期:——
The selective functionalization of calix[4]arenes 1 by iodination at the upper rim in the presence of other functionalities is described. The resulting (partly) iodinated calix[4]arenes 2 are good starting materials for the preparation of both the corresponding carboxylic ester and amino derivatives 3 and 6, respectively.