An improved synthesis of chiral oxazolidine-2-selones: highly sensitive selenium-77 NMR reagents for the detection and quantitation of chirality
摘要:
The synthesis of the title compounds from readily available oxazolines has been accomplished in one step in high yield. These chiral reagents exhibit extraordinary Se-77 chemical shift sensitivity and are useful for the detection and quantitation of chirality at remotely disposed chiral centers.
Synthesis and Characterization of Acylated Chiral Oxazolidine-2-selones: Selone Chiral Derivatizing Agents for the Detection and Quantitation of Remotely Disposed Chiral Centers
作者:Jie Peng、Mary E. Barr、David A. Ashburn、Lukasz Lebioda、Albert R. Garber、Rodolfo A. Martinez、Jerome D. Odom、R. Bruce Dunlap、Louis A. Silks
DOI:10.1021/jo00122a039
日期:1995.9
Racemic and chiral carboxylic acids and acid chlorides are coupled cleanly to oxazolidine-2-selone chiral derivatizing agents (CDA's) with yields ranging from 85 to 99%. Se-77 NMR spectroscopy provides a highly sensitive method for the determination of the enantiomeric excesses of these remotely disposed chiral centers. The geometrical relationship between the selenocarbonyl and the adduct carbonyl (syn or anti) appears to have a profound effect on the chemical shift difference (Delta delta(Se)) observed for pairs of adduct diastereomers. Crystallographic and solution state NMR studies suggest that the syn orbital overlap enhances the Delta delta(Se).
An improved synthesis of chiral oxazolidine-2-selones: highly sensitive selenium-77 NMR reagents for the detection and quantitation of chirality
作者:Louis A. Silks、Jie Peng、Jerome D. Odom、R. Bruce Dunlap
DOI:10.1021/jo00024a003
日期:1991.11
The synthesis of the title compounds from readily available oxazolines has been accomplished in one step in high yield. These chiral reagents exhibit extraordinary Se-77 chemical shift sensitivity and are useful for the detection and quantitation of chirality at remotely disposed chiral centers.