Dicyclohexylcarbodiimide → Carbonyl-4-benzoylthiopyrrolidine

Participants

Reaction Steps

In 10 ml of tetrahydrofuran was dissolved 209 mg of 2-(2-(p-nitrobenzyloxycarbonylamino)ethoxy)acetic acid, followed by stirring on an ice bath. To this were added 161 mg of 1-hydroxybenzotriazole and 433 mg of dicyclohexylcarbodiimide, followed, after 1 hour of stirring at the same temperature, by the addition of 523 mg of (2S,4S)-1-(p-nitrobenzyloxycarbonyl)-2-(piperazine-1-yl)carbonyl-4-benzoylthiopyrrolidine and 0.146 m of triethylamine and subsequent 1 hour of stirring. After removing insoluble material by filtration, the resulting filtrate was evaporated under a reduced pressure, and a residue was subjected to a silica gel column chromatography to yield 402 mg of (2S,4S)-1-(p-nitrobenzyloxycarbonyl)-2-(4-(2-(2) -(p-nitrobenzyloxycarbonylamino) ethoxy)acetyl)piperazine-1-yl)carbonyl-4-benzoylthiopyrrolidine as the compound of interest.

Provenance & Evidence