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In the originally reported Ns-amide strategy, PhSH-K2CO 3 or HSCH2CO2H-LiOH mixtures were used as the typical deprotection reagents of Ns group, and aprotic solvents, e.g. MeCN or DMF, were used.12 In the present study, EtSNa was used for the deprotection of the cyclophanes 9 and 14 because this reagent is commercially available as a convenient thiolate source. Additionally, the bridge Ns amide parts are sterically hindered, we considered that primary alkyl thiolate would serve as an effective deprotection agent in the present case. As for the solvent employed in this work, the solubility of the Ns-protected cyclophanes 9 and 14 in the originally reported solvents was poor, thus, we selected DMSO in which Ns amides 9 and 14 were slightly soluble and the deprotection proceeded successfully
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12 In the present study, EtSNa was used for the deprotection of the cyclophanes 9 and 14 because this reagent is commercially available as a convenient thiolate source. Additionally, the bridge Ns amide parts are sterically hindered, we considered that primary alkyl thiolate would serve as an effective deprotection agent in the present case. As for the solvent employed in this work, the solubility of the Ns-protected cyclophanes 9 and 14 in the originally reported solvents was poor, thus, we selected DMSO in which Ns amides 9 and 14 were slightly soluble and the deprotection proceeded successfully.
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