反应详情

LiOH solution (0.15M, 53 mL, 8 mmol) was added to the lactone amide 24a (996 mg, 3.96 mmol) in an ice bath and stirred for 1 h. The mixture was acidified to pH 2-3 with 1N HCl and evaporated, co-evaporated with toluene several times, and dried under vacuum overnight. (1R,2S)-cyclopropanesulfonic acid (1-amino-2-vinyl-cyclopropane-carbonyl)amide hydrochloride (4.21 mmol) and HATU (1.78 g, 4.68 mmol) were added. The mixture was cooled in an ice bath under argon, DMF (25 mL) and then DIEA (2.0 mL, 11.5 mmol) were added. After stirring for 30 min, the mixture was stirred at rt for 3 h. After evaporation of solvent, the residue was dissolved in EtOAc (120 mL), washed successively with 0.5 N HCl (20 mL) and saturated NaCl (2×20 mL), and dried over Na2SO4. Flash column chromatography (200 g YMC silica gel, 2-4% MeOH in CH2Cl2 gave white solids (1.25 g, 66%).

1. customevaporated, co-evaporated with toluene several times
2. customdried under vacuum overnight
3. temperatureThe mixture was cooled in an ice bath under argon
4. stirringAfter stirring for 30 min
5. stirringthe mixture was stirred at rt for 3 h
6. customAfter evaporation of solvent
7. dissolutionthe residue was dissolved in EtOAc (120 mL)
8. washwashed successively with 0.5 N HCl (20 mL) and saturated NaCl (2×20 mL)
9. dry with materialdried over Na2SO4