反应详情

A solution of p-methoxybenzyl (6R,7R)-7-phenylacetamido-3-(trifluoromethanesulphonyloxy)ceph-3-em-4-carboxylate (1.0 g, 1.7 mmol) in dichloromethane (25 ml) was treated with a solution of m-chloroperbenzoic acid (70%) (0.45, 1.8 mmol) in dichloromethane (15 ml). After stirring at room temperature for 30 min the solvent was evaporated and the residue crystallised from dichloro-methane/hexane to give the title compound (775 mg, 75%); m/z (3-NOBA sodium) 625 (MNa+); νmax (KBr) 1793, 1736, 1649 cm-1 ; δH (CDCl3) 3.47 (1H, dd, J 18.4, 1.4 Hz), 3.63 (1H, d, J 15.6 Hz), 3.66 (1H, d, J 15.6 Hz), 3.81 (3H, s), 3.87 (1H, d, J 18.4 Hz), 4.53 (1H, dd, J 4.8, 1.4 Hz), 5.20 (1H, d, J 11.7 Hz), 5.36 (1H, d, J 11.7 Hz), 6.07 (1H, dd, J 4.9, 9.8 Hz), 6.75 (1H, d, J 9.8 Hz), 6.89 (2H, d, J 8.6 Hz), 7.25-7.36 (7H, m).

1. customwas evaporated
2. customthe residue crystallised from dichloro-methane/hexane