Diisopropylethylamine → HCID 131720446, compound

Participants

Reaction Steps

886 mg of 4-nitrobenzyl (1R,5R,6S)-2-(diphenylphosphoryloxy)-6-[(1R)-1-hydroxyethyl]-1-methyl-1-carbapen-2-em-3-carboxylate (prepared as described in Preparation 123) was dissolved in 10 ml of dry acetonitrile, and 0.26 ml of diisopropylethylamine and 873 mg of (2S,4S)-4-mercapto-2-[3-(1-1,2,4-triazolyl)-1-azetidinylcarbonyl]-1-(4-nitrobenzyloxycarbonyl)pyrrolidine (prepared as described in Preparation 120) dissolved in 5 ml of acetonitrile were added dropwise at the same time to the resulting solution, whilst ice-cooling. The mixture was then stirred at the same temperature for 3 hours. At the end of this time, the solvent was removed by distillation under reduced pressure, and the residue was diluted with ethyl acetate. The resulting mixture was washed with water, with an aqueous solution of sodium hydrogencarbonate, with water and with a saturated aqueous solution of sodium chloride. The aqueous layer was dried over anhydrous magnesium sulfate and then concentrated by evaporation under reduced pressure. The residue was purified by silica gel column chromatography, using a gradient solution method, with mixtures of ethyl acetate and methanol ranging from 6:1 to 4:1 by volume as the eluent, to obtain 661 mg of the title compound, as a powder.

Provenance & Evidence