Synthesis and stereochemical configuration of diastereomeric inherently chiral calixarenes with ABCH and ABCD type of substitution at the lower rim
摘要:
By sulfonylation of tetra(p-tert-butyl)-27-propoxy-25-[N-(1-phenylethyl)carbamoylmethoxy]calix[4] arene diastereomeric inherently chiral calixarenes with the ABCH substitution at the lower rim were synthesized and separated by column chromatography. The alkylation of these compounds afforded the corresponding calixarenes with the ABCD substitution type. The absolute configuration of compounds was established by XRD analysis.
An Approach to Optically Pure Bridging Chiral <i>p</i>-<i>tert</i>-Butylcalix[4]arenes through a Homologous Anionic Ortho-Fries Rearrangement
作者:Wen-Qiang Xu、Wen-Shan Liu、Jiu-Xing Yan、Shi-Kun Ma、Jing Guo、Jun-Min Liu、Run-Ling Wang、Shao-Yong Li
DOI:10.1021/acs.joc.6b01682
日期:2016.11.18
A novel efficient approach to optically pure bridging chiral calix[4]arenes through a homologous anionic ortho-Fries rearrangement of inherently chiral calix[4]arenes was presented for the first time. As a result, two pairs of N,N′-dimethylformamidyl-substituted bridging chiral p-tert-butylcalix[4]arene enantiomers were facilely obtained. Their absolute configurations were determined through ROESY