N-(tert-butoxycarbonyl)glycine → ethyl N-(tert-butoxycarbonyl)glycyl-3-(2-methoxy-4-pyridinyl)alaninate

Participants

Reaction Steps

To a 100-mL round-bottomed flask was added ethyl 3-(2-methoxy-4-pyridinyl)alaninate (1.47 g, 6.56 mmol), N-α-t-boc-glycine (1.26 g, 7.22 mmol, Aldrich, St. Louis, Mo.), HATU (2.99 g, 7.87 mmol, Aldrich, St. Louis, Mo.) and N,N-diisopropylethylamine (3.42 mL, 19.68 mmol, Aldrich, St. Louis, Mo.) in DMF (6 mL). The reaction mixture was stirred room temperature for 18 h, diluted with water (50 mL), and extracted with EtOAc (2×20 mL). The organic extract was washed with saturated NaCl (30 mL) and dried over Na2SO4. The solution was filtered and concentrated in vacuo to give the crude material as a light-yellow oil. The crude product was purified by silica gel chromatography, eluting with 60% EtOAc/hexanes to give ethyl N-(tert-butoxycarbonyl)glycyl-3-(2-methoxy-4-pyridinyl)alaninate (2.31 g) as a colorless oil.

Provenance & Evidence