反应详情

A mixture of p-nitrobenzyl 2-azido-carbapen-2-em-3-carboxylate (11.3 mg, 34 micromol), vinyl acetate (0.1 ml), and solid sodium bicarbonate in dry dichloromethane was kept 2 days at ambient temperature, filtered through florisil, and evaporated under vacuum. The residue was chromatographed on one 15 cm ×20 cm 250 micron silica gel preparative thin layer chromatography plate developed with 5:1 (v/v) diethyl ether-ethyl acetate. The band centered at Rf 0.20 was eluted with ethyl acetate and the eluate was evaporated under vacuum to provide 5.5 mg (41%) p-nitrobenzyl 2-(2-acetoxyaziridin-1-yl)-carbapen-2-em-3-carboxylate; IR (CH2Cl2): 1770, 1735 cm-1 ; NMR (CDCl3): δ 1.90 dd (J1 =6 Hz, J2 =7 Hz, 1H), 2.10 t (J=7 Hz, 1H), 2.13 s (3H), 2.76 bd (J=5 Hz, 2H), 2.85 dd (J 1 =2.5 Hz, J2 =15 Hz, 1H), 3.25 dd (J1 =5 Hz, J2 =15 Hz, 1H), 4.12 m (1H), 4.87 dd (J1 =6 Hz, J2 =7 Hz, 1H), 5.27 s (2H), 7.49 d (J=9 Hz, 2H), 8.25 d (J=9 Hz, 2H).

1. filtrationfiltered through florisil
2. customevaporated under vacuum
3. customThe residue was chromatographed on one 15 cm ×20 cm 250 micron silica gel preparative thin layer chromatography plate
4. washwas eluted with ethyl acetate
5. customthe eluate was evaporated under vacuum