3-[[[(2S,4S)-4-Mercapto-1-(4-nitrobenzyloxy)carbonyl-2-pyrrolidinyl]carbonyl]amino]benzoic acid

Uses

3-[[[(2S,4S)-1-(4-Nitrobenzyloxycarbonyl)-4-mercaptopyrrolidin-2-yl]carbonyl]amino]benzoic Acid is an intermediate in the preparation of Ertapenem (E635000) and intermediates.

Synthesis

At 60 °C, m-aminobenzoic acid (9.45 g, 68.9 mmol) was dissolved in 200 g of methanol and 1 g of tributylphosphine and 400 ml of a methanolic solution of 4M HCl were added. Subsequently, 220 g of methanol solution of 4-nitrobenzyl (1S,4S)-3-oxo-2-thia-5-azabicyclo[2.2.1]heptane-5-carboxylate (19.8 g, 64.28 mmol) was slowly added. The reaction was stirred at the same temperature for 3 hours. After completion of the reaction, the slurry was cooled and filtered to obtain white crystals. The white crystals were washed with methanol and then dried under vacuum to afford 3-((2S,4S)-4-mercapto-1-(((4-nitrobenzyloxy)oxy)carbonyl)pyrrolidine-2-carboxamido)benzoic acid (127.8 g) in 97% molar yield and 99.2% HPLC purity.

References

[1] Patent: CN105566193, 2016, A. Location in patent: Paragraph 0014; 0015
[2] Patent: CN104130262, 2017, B. Location in patent: Paragraph 0132; 0133; 0134