Inherently Chiral Calix[4]arenes Via Oxazoline Directed Ortholithiation: Synthesis and Probe of Chiral Space
Overview
Affiliations
The diastereoselective oxazoline-directed lithiation of calix[4]arenes is reported with diastereoselective ratios of greater than 100:1 in some instances. Notably, it has been found that the opposite diastereomer can be accessed via this approach merely through the choice of an alkyllithium reagent. The inherently chiral oxazoline calix[4]arenes have also been preliminarily examined as ligands in the palladium-catalyzed Tsuji-Trost allylation reaction, returning results comparable to their planar chiral ferrocene counterparts pointing towards future application of these types of compounds.
Li T, Zhang Y, Du C, Yang D, Song M, Niu J Nat Commun. 2024; 15(1):7673.
PMID: 39242562 PMC: 11379863. DOI: 10.1038/s41467-024-52133-8.
Attempted synthesis of a -metalated calix[4]arene.
Jurisch C, Arnott G Beilstein J Org Chem. 2019; 15:1996-2002.
PMID: 31501666 PMC: 6719732. DOI: 10.3762/bjoc.15.195.
Recent applications of chiral calixarenes in asymmetric catalysis.
Durmaz M, Halay E, Bozkurt S Beilstein J Org Chem. 2018; 14:1389-1412.
PMID: 29977403 PMC: 6009176. DOI: 10.3762/bjoc.14.117.