1-Ethyl-3-(3'-dimethylaminopropyl)carbodiimide → HCID 54419005, compound

Participants

Reaction Steps

A solution of the less polar stereoisomer of (11S)-5-methyl-3-(10-oxo-1,9-diazatricyclo[11.6.1.014,19 ]eicosa-13(20),14(19),15,17-tetraen-11-ylcarbamoyl)hexanoic acid (210 mg) and 5-hydroxybenzotriazole monohydrate (109 mg) in anhydrous DMF (20 mL) under argon was cooled to 0° C. (ice bath). To this mixture was added EDCI (282 mg) and stirring was continued for 0.5 hours. O-benzylhydroxylamine (0.27 mL) was added to the solution and the reaction mixture was left to warm to room temperature overnight. All volatiles were removed under reduced pressure. The residue was taken up in CH2 Cl2 (100 mL) and 20% HCl (100 mL) and transferred to a separatory funnel. The organic phase was isolated and the aqueous phase washed (2×100 mL) with CH2Cl2. The organic materials were then washed consecutively with 5% NaHCO3, brine, dried (MgSO4), filtered and concentrated to provide (11S)-N-benzyloxy-5-methyl-3-(10-oxo-1,9-diazatricyclo[11.6.1.014,19 ]eicosa-13(20),14(19),15,17-tetraen-11-ylcarbamoyl) hexanamide as a crystalline product. The product was further purified by column chromatography on silica gel followed by crystallization from hot ethyl acetate/CH2Cl2, to provide the more polar stereoisomer of the compound having a melting point at 232°-233° C. m.p., and the less polar stereoisomer of the compound having a melting point at 251°-253° C.

Provenance & Evidence