Synthesis of lariat ethers with pendent amine, amide,<i>O</i>-benzylhydroxamate, and urethane groups
作者:Sadik Elshani、Hong-Sik Hwang、Michael J. Pugia、Jan Krzykawski、Richard A. Bartsch
DOI:10.1002/jhet.5570400307
日期:2003.5
Synthetic routes to twenty-six new crown ether compounds with pendent amine, amide, O-benzylhydrox-amate, and urethanegroups are reported. The new lariat ether compounds are based on sym-dibenzo-16-crown-5, sym-dicyclohexano-16-crown-5, and 14-crown-4 scaffolds.
Synthesis of lipophilic lariat ethers with pendant<i>N</i>-(X)sulfonyl carboxamide groups
作者:Hui Hu、Richard A. Bartsch
DOI:10.1002/jhet.5570410412
日期:2004.7
Synthetic routes to sixteen lipophiliclariatether N-(X)sulfonylcarboxamides with X = trifluoromethyl, methyl, phenyl, and p-nitrophenyl are described. For this new family of proton-ionizable lariatethers in which the acidity can be ‘tuned’ by Xgroup variation, the ring size is systematically varied from 12-crown-4 to 14-crown-4 to 15-crown-5 to 18-crown-6.