A novel method for the upper rim alkoxy-substitution of calix[4]arene via a bis(spirodienone) route
作者:Sreeja Thulasi、Ganga V. Bhagavathy、Jijy Eliyan、Luxmi R. Varma
DOI:10.1016/j.tetlet.2008.11.118
日期:2009.2
A mild and efficient one-step procedure for the upper rim modification of calix[4]arene via a bis(spirodienone) is described. The bis(spirodienone) on reaction with alcohols in the presence of p-TSA affords mono- and 1,3-disubstituted alkoxy derivatives in moderate to good yields.
A seemingly ipso-like nucleophilic substitution of the upper rim of p-tert-butylcalix[4]arene is accomplished by an indirect method involving calix[4]arene derived bis(spirodienone). This method not only provides both mono and 1,3-diaryloxy calixarenes but also enables the synthesis of upper rim monothio substitutedcalix[4]arenes. A modification of the methodology can be successfully extended for