Rim-Differentiated C₅-Symmetric Tiara-Pillar[5]arenes.

ABSTRACT: The synthesis of "rim-differentiated" C₅-symmetric pillar[5]arenes, whose two rims are decorated with different chemical functionalities, has remained a challenging task. This is due to the inherent statistical nature of the cyclization of 1,4-disubstituted alkoxybenzenes with different substituents, which leads to four constitutional isomers with only 1/16th being rim-differentiated. Herein, we report a "preoriented" synthetic protocol based on FeCl₃-catalyzed cyclization of asymmetrically substituted 2,5-dialkoxybenzyl alcohols. This yields an unprecedented 55% selectivity of the C₅-symmetric tiara-like pillar[5]arene isomer among four constitutional isomers. Based on this new method, a series of functionalizable tiara-pillar[5]arene derivatives with C

SUBMITTER: Guo M 

PROVIDER: S-EPMC5765533 | biostudies-literature | 2018 Jan

REPOSITORIES: biostudies-literature