1-Ethyl-3-(3'-dimethylaminopropyl)carbodiimide → (1-{2-[(2-Isopropyl-5-methyl-cyclohexanecarbonyl)-amino]-1-phenyl-ethylcarbamoyl}-ethyl)-carbamic acid tert-butyl ester

Beteiligte Stoffe

Reaktionsschritte

A 15 mL reaction vessel equipped with a stir bar was charged with THF (15 mL), Boc-(R)-alanine (52 mg, 0.273 mmoles), HOBt (37.87 mg, 0.273 mmoles), EDCI (53 mg, 0.273 mmoles) and TEA (37 μl, 0.273 mmoles). The reaction mixture was stirred for 15 min. whereupon 2-isopropyl-5-methyl-cyclohexanecarboxylic acid (2-amino-2-phenyl-ethyl)-amide (75 mg, 0.248 mmol) was added and stirred for an additional 3 h. Ethyl acetate (10 mL) and H2O (10 mL) were added to the reaction mixture. The heterogeneous mixture was transferred to a separatory funnel where the aqueous phase was separated and re-extracted with ethyl acetate (2×10 mL). The organic phases were combined and washed with 1N HCl (2×10 mL), H2O (1×10 mL), sat NaHCO3 (3×10 mL), brine (10 mL), dried over MgSO4, filtered and concentrated under reduced pressure. The residue was purified by flash chromatography on silica gel (20% ethyl acetate/hexane for elution) provided the title compounds as colorless solid (30 mg).

Herkunft & Nachweise