Benzenesulfonylcarbonitrile oxide. 5. Face selectivity of cycloaddition to chiral terminal alkenes
作者:Peter A. Wade、Shankar M. Singh、M.Krishna Pillay
DOI:10.1016/0040-4020(84)85065-6
日期:1984.1
The diastereomer ratio for cycloaddition of benzenesulfonylcarbonitrile oxide (BSNO) to a series of (S)-vinylglycine-derived alkenes varied from 30:70 to 66:34 depending on the substitutents at the chiral center. Isomer ratios were routinely determined by 1H-NMR; isolation confirmed the results in several cases. Isomer assignment was based on comparison to acivicin where the absolute configuration