HCID 178418361, compound → HCID 178486638, compound

Participants

Reaction Steps

To a solution of 3.00 g of NG -nitro-N2 -(6,7-dimethoxy-2-naphthylsulfonyl)-L-arginyl-N-phenethylalanine benzyl ester in 50 ml of acetic acid was added 0.5 of palladium-black and then the mixture was shaken in a hydrogen atmosphere for 100 hours at room temperature. At the end of this period, the ethanol solution was filtered to remove the catalyst and evaporated to dryness. The residue was washed several times with dry diethyl ether and chromatographed on 80 ml of Daiaion ®SK 102 ion exchange resin (200-300 mesh, H+ form, manufactured by Mitsubishi Chemical Industries Limited) packed in water, washed with water, and eluted with 3% ammonium hydroxide solution. The fraction eluted from 3% ammonium hydroxide was evaporated to dryness to give 1.64 g (67%) of N2 -(6,7-dimethoxy-2-naphthylsulfonyl)-L-arginyl-N-phenethylalanine as an amorphous solid.

Provenance & Evidence