Synthesis of a chiral macrocyclic dibenzodicyclohexanotetraamide‐containing stationary phase for liquid chromatography

Allyloxy‐substituted macrocyclic dibenzodicyclohexanotetraamide 2 was prepared by the following sequence. MonoBoc‐protected chiral 1,2‐cyclohexanediamine ( 3 ) was treated with isophthaloyl chloride followed by removal of the Boc group to form bisisophthalamide 5. Compound 5 was then treated with allyloxyphthaloyl chloride to form the macrocyclic tetraamide 2 in a 56% yield. Chiral selector 2 was converted to its ethoxydimethylsilane derivative and heated in a suspension of silica gel and toluene to form the chiral macrocycle‐containing silica gel phase 1. This phase separated the enantiomers of (±)‐α‐methylbenzylamine and (±)‐DL‐α‐aminobutyric acid methyl ester in a liquid chromatograph.