Diisopropylethylamine → HCID 68443476, compound

Participants

Reaction Steps

120 μl of DIEA are added to a solution of 102 mg of 3-(carboxy-cyano-methylene)-8-aza-bicyclo[3.2.1]octane-8-carboxylic acid tert-butyl ester, 162 mg of 4-bromo-2,5-dichloro-thiophene-3-sulfonamide, 583 μl of PPA in DMF (50%) and 43 mg of DMAP in 4 ml of DMA, and the mixture obtained is stirred at RT for 48 hours. From the mixture obtained solvent is removed in vacuo and the residue obtained is subjected to preparative HPLC on an RP-18 column. 3-[2-(4-Bromo-2,5-dichloro-thiophene-3-sulfonylamino)-1-cyano-2-oxo-ethylidene]-8-aza-bicyclo[3.2.1]octane-8-carboxylic acid tert-butyl ester in the form of a foam is obtained.

Provenance & Evidence