反应详情

To a cold (−15° C.) solution of Boc-Pro-Gly-OH (610 mg, 2.24 mmol) and NMM (369 μl, 3.36 mmol) in THF (8 mL) was added ECF (2201 μl, 2.3 mmol) and stirred vigorously. After 2 min. a solution of 1-amino-3-propyl alcohol (220 mg, 2.68 mmol) in THF (2 mL) was added to it followed by NMM (505 mg, 5 mmol) and stirred for further 30 minutes. The mixture was warmed to r.t. and stirred for 8 h. The solvent was removed under reduced pressure to give a residue which was diluted with EtOAc and washed with saturated citric acid, saturated NaHCO3 and the organic layer was dried over Na2SO4 and concentrated under vacuum to give a residue, which was purified by silica gel flash column chromatography (EtOAc:MeOH—50:1) to give the desired product as a thick oil in good yields (633 mg, 80%). TLC (MeOH:DCM—1:4; Rf—0.5).

1. stirringstirred for further 30 minutes
2. stirringstirred for 8 h
3. customThe solvent was removed under reduced pressure
4. customto give a residue which
5. washwashed with saturated citric acid, saturated NaHCO3
6. dry with materialthe organic layer was dried over Na2SO4
7. concentrationconcentrated under vacuum
8. customto give a residue, which
9. customwas purified by silica gel flash column chromatography (EtOAc:MeOH—50:1)