Diphenylphosphinic chloride → 4-Nitrobenzyl (1R,5S,6S)-2-[(2S,4S)-2-[4-(2-hydroxyethyl)-1-piperazinylcarbonyl]-1-(4-nitrobenzyloxycarbonyl)pyrrolidin-4-ylthio]-6-[(1R)-1-hydroxyethyl]-1-methyl-1-carbapen-2-em-3-carboxylate

Participants

Reaction Steps

1.82 ml of diphenylphosphoryl chloride and 1.54 ml of diisopropylethylamine were added dropwise, whilst ice-cooling, to a solution of 3.0 g of 4-nitrobenzyl (1R,5R,6S)-6-[(1R)-1-hydroxyethyl]-1-methyl-2-oxo-1-carbapenam-3-carboxylate in 38 ml of dry acetonitrile, and the resulting mixture was stirred at the same temperature for 1 hour. 1.54 ml of diisopropylethylamine and a solution of 3.63 g of (2S,4S)-2-[4-(2-hydroxyethyl)-1-piperazinylcarbonyl]-4-mercapto-1-(4-nitrobenzyloxycarbonyl)pyrrolidine (prepared as described in Preparation 54) in 30 ml of dry acetonitrile were then simultaneously added dropwise to the mixture, whilst ice-cooling, and the resulting mixture was stirred at the same temperature for 3 hours, after which it was allowed to stand overnight in a refrigerator. At the end of this time, the reaction mixture was worked up in a similar manner to that described in Example 49(b). The crude product was then purified by column chromatography through silica gel, using a 2:1 by volume mixture of ethyl acetate and methanol as the eluent, to give 3.4 g of the title compound, as a powder. The infrared absorption spectrum and nuclear magnetic resonance spectrum of the product were identical with those of the compound prepared as described in step 54(i), above.

Provenance & Evidence