反应详情

To a solution of 2-{4-[2-amino-3-(4-fluorophenyl)-propionyl]-3-cyclopropylmethyl-2-oxo-piperazin-1-yl}-N-methyl-3-naphthalen-2-yl-propionamide, 18, (44 mg, 0.068 mmol) in DMF (1 mL) are added 2-tert-butoxycarbonylamino-2-methyl-propionic acid (44 mg, 0.079 mmol), 1-hydroxybenzotriazole (20 mg, 0.148 mmol), N-methylmorpholine (41 mg, 0.41 mmol) and 1-(3-dimethylaminopropyl)-3-ethylcarbodiimide (16 mg, 0.083 mmol) consecutively. The reaction mixture is stirred for 3 hours, quenched with aqueous NH4Cl and extracted several times with ethyl acetate. The combined extracts are dried over Na2SO4, filtered and concentrated in vacuo to a residue which is purified over silica gel (CH2Cl2/CH3OH, 13:1) to afford 45 mg (93% yield) of the desired product. MS (ESMS) m/z 716.3 (M+H)+.

1. customquenched with aqueous NH4Cl
2. extractionextracted several times with ethyl acetate
3. dry with materialThe combined extracts are dried over Na2SO4
4. filtrationfiltered
5. concentrationconcentrated in vacuo to a residue which
6. customis purified over silica gel (CH2Cl2/CH3OH, 13:1)