Add time:07/14/2019         Source:sciencedirect.com

N-t-Boc 6-amino-1,11-(20-crown-6)-6,7-dihydro-5H-dibenzo[a,c]cycloheptene-6-carboxylic acid methyl ester: Boc-[20-C-6]-Bip-OMe 1, a new crown-carrier-α,α-disubstituted glycine with axial dissymmetry and a potential building block for the synthesis of polypeptide supramolecular devices, has been synthesized at the racemic state by phase transfer bis-alkylation of a glycine tert-butyl ester Schiff base with 2,2′-bis-(bromomethyl)-6,6′-dimethoxy-1,1′-diphenyl, followed by demethylation, esterification, N-protection and crown formation upon cyclization of the di-cesium salt of the resulting diphenol with pentaethyleneglycol ditosylate.

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