4-Methylmorpholine → (S)-4,4-difluoro-2-(5-hydroxy-adamantan-2-ylcarbamoyl)-pyrrolidine-1-carboxylic acid benzyl ester

Participants

Reaction Steps

To a solution of 4-amino-adamantan-1-ol (0.58 g, g, 0.0035 mol) in DMF (12 mL) was added (S)-4,4-difluoro-pyrrolidine-1,2-dicarboxylic acid 1-benzyl ester (1.0 g, CAS: 72180-27-9, Journal of Medicinal Chemistry, 2007, 50(20), 4953-4975), NMM (0.9 mL) and HOBT (0.644 g), and the reaction was stirred for 10 minutes. EDCI (0.80 g) was then added and the reaction mixture was stirred at room temperature for 5 h. The reaction was diluted with water (30 mL). The aqueous layer was extracted with ethyl acetate (3×10 mL). The organic layer was separated and dried over anhydrous Na2SO4. Concentration of the organic layer under reduced pressure using rotary evaporator gave sticky crude material, which was purified through column chromatography (10-20% ethyl acetate:hexane, silica 100-200, Diameter of column—2.5 cm, Height of silica—approx. 7 inch) to give the desired (S)-4,4-difluoro-2-(5-hydroxy-adamantan-2-ylcarbamoyl)-pyrrolidine-1-carboxylic acid benzyl ester (1.2 g, 78%) as a white solid.

Provenance & Evidence