Potassium Carbonate → 7-[3-(4-Cyano-benzenesulfonylamino)-propyl]-9-oxa-3,7-diaza-bicyclo[3.3.1]nonane-3-carboxylic acid tert-butyl ester

Participants

Reaction Conditions

Reaction Steps

A suspension of N-(3-Bromo-propyl)-4-cyano-benzenesulfonamide (6.39 g, 0.021 mol; see step (i) above), 9-oxa-3,7-diaza-bicyclo[3.3.1]nonane-3-carboxylic acid tert-butyl ester (4.32 g, 0.0189 mol see WO 01/28992) and dry K2CO3 (10.16 g, 0.0735 mol) in dry acetonitrile (70 ml) was stirred at 60° C. overnight under N2 atmosphere. The reaction mixture was filtered through celite and filtrate was concentrated under reduced pressure. The residue was purified by column chromatography over silica gel using 50% ethyl acetate in petroleum ether, as eluent to give the sub-title compound (4.29 g) as a solid.

Provenance & Evidence