Microwave irradiation assisted synthesis, alkylation reaction, and configuration analysis of aryl pyrogallol[4]arenes
摘要:
A series of aryl pyrogallol[4] arenes were efficiently synthesized in excellent yields by cyclocondensation of pyrogallol with aromatic aldehydes under microwave irradiation. The structures of aryl pyrogallol[4] arenes were confirmed by characterization of their acylated derivatives. Under microwave irradiation, alkylation reactions of aryl pyrogallol[4] arenes with some alkylating reagents such as n-butyl iodide, benzyl chloride, and ethyl alpha-chloroacetate were also finished quickly to yield fully O-alkylated products. The H-1 NMR spectra and crystal structures showed that the acylated and alkylated aryl pyrogallol[4] arenes existed mainly in rctt (cis-trans-trans) configuration. (c) 2007 Elsevier Ltd. All rights reserved.
Microwave irradiation assisted synthesis, alkylation reaction, and configuration analysis of aryl pyrogallol[4]arenes
摘要:
A series of aryl pyrogallol[4] arenes were efficiently synthesized in excellent yields by cyclocondensation of pyrogallol with aromatic aldehydes under microwave irradiation. The structures of aryl pyrogallol[4] arenes were confirmed by characterization of their acylated derivatives. Under microwave irradiation, alkylation reactions of aryl pyrogallol[4] arenes with some alkylating reagents such as n-butyl iodide, benzyl chloride, and ethyl alpha-chloroacetate were also finished quickly to yield fully O-alkylated products. The H-1 NMR spectra and crystal structures showed that the acylated and alkylated aryl pyrogallol[4] arenes existed mainly in rctt (cis-trans-trans) configuration. (c) 2007 Elsevier Ltd. All rights reserved.