Trifluoroacetic acid → N1-[(1R)-1-(4-bromophenyl)-2-(1-pyrrolidinyl)ethyl]-N2-(cyanomethyl)-N2-(3,4-dichlorophenyl)-N1-methylglycinamide

Participants

Reaction Steps

[(1R)-1-(4-bromophenyl)-2-(1-pyrrolidinyl)ethyl]methylamine (3.03 g, 10.7 mmol) and N-(cyanomethyl)-N-(3,4-dichlorophenyl)glycine (2.77 g, 10.7 mmol) were dissolved in 100 mL of dimethylformamide. Triethylamine (4.47 mL, 32.1 mmol) was delivered to the room temperature mixture, and the solution was allowed to stir for several minutes before a separate solution of 1H-1,2,3-benzotriazol-1-yloxy-tris(dimethylamino)-phosphonium hexafluorophosphate (BOP reagent, 4.73 g, 10.7 mmol) dissolved in 10 mL of dimethylformamide was added to the mixture at room temperature. The reaction was maintained at that temperature for 2 hours, before it was determined to be complete by LCMS (Eclipse XDB C18 (4.6×250 mm); trifluoroacetic acid: 1-99% B for 10 min, ES) Rt=8.4 min and m/e 525 [M+1]+. The reaction mixture was treated with 100 mL of 50% H2O and 50% saturated sodium bicarbonate solution and was allowed to stir at room temperature for one hour. After transferring the mixture to a 1 L separatory funnel, the aqueous layer was extracted three times with 200 mL portions of ethyl acetate. The organic layers were combined and washed once with 100 mL of H2O and once with 100 mL of brine. The organic layer was dried over MgSO4, filtered, and concentrated using rotary evaporation and then placed under high vacuum to give 6.1 g of N1-[(1R)-1-(4-bromophenyl)-2-(1-pyrrolidinyl)ethyl]-N2-(cyanomethyl)-N2-(3,4-dichlorophenyl)-N1-methylglycinamide, which was carried onto the next step as crude material. MS (ES) m/e 525 [M+H]+.

Provenance & Evidence