反应详情

A mixture of tert-butyl 4-(biphenyl-4-yl)-3-(tert-butoxycarbonylamino)butanoate (110 mg, 0.267 mmol) and HCl in 1,4-dioxane (0.668 ml, 2.67 mmol) was stirred for 2 hours, and the reaction mixture was concentrated under reduced pressure. To a solution of 1-(2-(benzyloxy)-2-oxoethyl)cyclopentanecarboxylic acid (65.6 mg, 0.214 mmol, 86% purity), EDC.HCl (51.2 mg, 0.267 mmol) and 1-hydroxy-7-azabenzotriazole (36.4 mg, 0.267 mmol) in DMF (1 ml) stirred for 1.5 hour, the obtained residue and DIPEA (0.093 ml, 0.535 mmol) were added. After stirred for 2.5 hours, the reaction was diluted with water. The products were extracted with EtOAc, washed with brine, dried over Na2SO4, filtered, and concentrated under reduced pressure. The obtained residue was purified by flash column chromatography on silica gel (eluent: heptane/EtOAc=100:0 to 0:100) to give tert-butyl 3-(1-(2-(benzyloxy)-2-oxoethyl)cyclopentanecarboxamido)-4-(biphenyl-4-yl)butanoate (38 mg); Retention time=1.89 minutes (condition B); MS (m+1)=556.3.

1. concentrationthe reaction mixture was concentrated under reduced pressure
2. stirringAfter stirred for 2.5 hours
3. extractionThe products were extracted with EtOAc
4. washwashed with brine
5. dry with materialdried over Na2SO4
6. filtrationfiltered
7. concentrationconcentrated under reduced pressure
8. customThe obtained residue was purified by flash column chromatography on silica gel (eluent: heptane/EtOAc=100:0 to 0:100)