Water → tert. Butyl (3SR,4SR)-3-[(5-chloro-thiophene-2-carbonyl)-amino]-4-hydroxy-pyrrolidine-1-carboxylate

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Reaction Steps

201 mg (1.2 mmol) 5-chlorothiophene-2-carboxylic acid and 436 mg (1.4 mmol) TBTU are suspended in 5 ml DCM and combined with 260 μl (1.9 mmol) TEA. The mixture is stirred for 30 minutes and then a solution of 250 mg (1.2 mmol) tert. Butyl (3SR,4SR)-3-amino-4-hydroxy-pyrrolidine-1-carboxylate in 5 ml DCM is added and the mixture is stirred for 16 hours at RT. Then the reaction mixture is poured into water and extracted with DCM. The organic phase is washed with sat. sodium chloride solution and, after being mixed with activated charcoal, dried on sodium sulphate. The mixture is filtered and the filtrate is evaporated to dryness. The residue thus obtained is purified by column chromatography (silica gel, eluant DCM/MeOH 10:1).

Provenance & Evidence