Chiral <i>N</i>-(<i>o</i>-aryl)-thiazolidinediones: synthesis from rhodanines and investigation on rotational enantiomers by NMR spectroscopy
摘要:
Sterically hindered N-(o-aryl)-rhodanines (a) (N-(o-aryl)-2-thioxo-4-thiazolidinones) have been synthesized and the N-(o-tolyl) and N-(o-chlorophenyl) derivatives have been converted to their dioxo analogs (b) (N-(o-aryl)-2,4-thiazolidine-diones). The chirality of the compounds in their conformational ground states was proved by detection of the diastereotopic protons or methyl groups at C-5 of the heteroring using H-1 and C-13 NMR spectroscopy. In the presence of the optically active auxiliary (S)-(+)-1-(9-anthryl)-2,2,2-trifluoroethanol the enantiomers of the racemic mixtures formed diastereomeric association complexes via H-bonding.
RAO R. P.; SINGH S. R.; ZAIDI N. B.; SINGH B., INDIAN J. CHEM., 1979, B 18, NO 4, 377-379
作者:RAO R. P.、 SINGH S. R.、 ZAIDI N. B.、 SINGH B.
DOI:——
日期:——
Rao,R.P. et al., Indian Journal of Chemistry - Section B Organic and Medicinal Chemistry, 1979, vol. 18, p. 377 - 379
作者:Rao,R.P. et al.
DOI:——
日期:——
Chiral <i>N</i>-(<i>o</i>-aryl)-thiazolidinediones: synthesis from rhodanines and investigation on rotational enantiomers by NMR spectroscopy
作者:Mehmet Karatas、Serap Koni、Ilknur Dogan
DOI:10.1139/cjc-76-3-254
日期:——
Sterically hindered N-(o-aryl)-rhodanines (a) (N-(o-aryl)-2-thioxo-4-thiazolidinones) have been synthesized and the N-(o-tolyl) and N-(o-chlorophenyl) derivatives have been converted to their dioxo analogs (b) (N-(o-aryl)-2,4-thiazolidine-diones). The chirality of the compounds in their conformational ground states was proved by detection of the diastereotopic protons or methyl groups at C-5 of the heteroring using H-1 and C-13 NMR spectroscopy. In the presence of the optically active auxiliary (S)-(+)-1-(9-anthryl)-2,2,2-trifluoroethanol the enantiomers of the racemic mixtures formed diastereomeric association complexes via H-bonding.