反应详情

Allyl(5R,6S)-6-[(R)-1-hydroxyethyl]-2-(1-ethyl-5-methylpyrazol-3-yl)carbapen-2-em-3-carboxylate (267 mg) in dichloromethane (3 ml) and ethyl acetate (3 ml) under argon was treated with sodium 2-ethylhexanoate (183 mg), followed by triphenylphosphine (24 mg), followed by tetrakis(triphenylphosphine)palladium(0) (35 mg) and the mixture was stirred for 45 min. Diethyl ether (100 ml) was then added, and after stirring for 90 minutes, the mixture was centrifuged. The residual solid was dried under a stream of argon, and then in a desiccator. The solid was then taken up in water containing sodium chloride and chromatographed on DIAION HP20SS resin, eluting with water, followed by water/THF mixtures; 1%, 2%, and 3%, THF. Fractions were monitored by HPLC, and those containing the product were combined, reduced in volume and freeze-dried to give sodium (5R,6S)-6-[(R)-1-hydroxyethyl]-2-(1-ethyl-5-methylpyrazol-3-yl)carbapen-2-em-3-carboxylate as a solid (168 mg); νmax (KBr) 1761, 1608, 1577, 1381, 1225 cm-1 ; λmax (H2O)/nm 298 (ε/dm3 mol-1 cm-1 8,531); δ (D2O) 1.26 (d, J ca. 6 Hz), 1.27 (d, J ca. 7 Hz) (together 5H), 2.23 (3H, s), 3.17 (2H, approx d, J ca. 9 Hz), 3.44 (1H, dd, J 2.9 & 6.0 Hz), 4.04 (2H, q, J 7.3 Hz), 4.15-4.25 (2H, m), 6.41 (1H, s) ppm.

1. stirringafter stirring for 90 minutes
2. customThe residual solid was dried under a stream of argon
3. additioncontaining sodium chloride
4. customchromatographed on DIAION HP20SS resin
5. washeluting with water
6. customfreeze-dried