Axially chiral N-(o-aryl)-2-thioxo-oxazolidine-4-one and rhodanine derivatives: enantiomeric separation and determination of racemization barriers
摘要:
Axially chiral 5,5-dimethyl-3-(o-aryl)rhodanine, 3-(o-aryl)rhodanine and 5,5-dimethyl-3-(o-aryl)-2-thioxo-4-oxazolidinone derivatives have been synthesized as racemates and the energy barriers to enantiomerization have been determined by dynamic H-1 NMR or by following the thermal equilibration of the separated enantiomers using chiral HPLC. The barriers to rotation about the N-sp2-C-aryl single bond were found to be 82-129 kJ/mol. The racemization barriers in these compounds are affected by the size of the ortho-substituent on the aryl ring. The magnitude of the barriers was found to change linearly with the van der Waals radii of the ortho-halogen substituents. (C) 2008 Elsevier Ltd. All Fights reserved.
Axially chiral N-(o-aryl)-2-thioxo-oxazolidine-4-one and rhodanine derivatives: enantiomeric separation and determination of racemization barriers
作者:Esra Müjde Yılmaz、İlknur Doğan
DOI:10.1016/j.tetasy.2008.09.001
日期:2008.9
Axially chiral 5,5-dimethyl-3-(o-aryl)rhodanine, 3-(o-aryl)rhodanine and 5,5-dimethyl-3-(o-aryl)-2-thioxo-4-oxazolidinone derivatives have been synthesized as racemates and the energy barriers to enantiomerization have been determined by dynamic H-1 NMR or by following the thermal equilibration of the separated enantiomers using chiral HPLC. The barriers to rotation about the N-sp2-C-aryl single bond were found to be 82-129 kJ/mol. The racemization barriers in these compounds are affected by the size of the ortho-substituent on the aryl ring. The magnitude of the barriers was found to change linearly with the van der Waals radii of the ortho-halogen substituents. (C) 2008 Elsevier Ltd. All Fights reserved.