反应详情

To a solution of 5-chloro-4-iodo-2-pyridinecarboxylic acid (CAN 120643-06-3, 100 mg, 353 μmol) in DMF (2 mL) was added TBTU (170 mg, 529 μmol) and 2-methyl-alanine methyl ester hydrochloride (59.6 mg, 388 μmol) to give a light yellow suspension. DIEA (308 μL, 1.77 mmol) was added and the reaction mixture was stirred for 3 h. The crude reaction mixture was concentrated in vacuo and the residue was purified by flash chromatography (silica, heptane/ethyl acetate gradient) to deliver the desired compound (40.5 mg, 30%) as yellow oil. MS (ESI, m/z): 382.9 (MH+).

1. customto give a light yellow suspension
2. customThe crude reaction mixture
3. concentrationwas concentrated in vacuo
4. customthe residue was purified by flash chromatography (silica, heptane/ethyl acetate gradient)