反应详情

To a solution of 3-(benzyloxy)-10-(((benzyloxy)carbonyl)amino)-4-oxo-4,6,7,8,9,10-hexahydro-7,10-ethanopyrimido[1,2-a]azepine-2-carboxylic acid, Intermediate 4 (1 g, 2.043 mmol) in CH2Cl2 (20 mL) was added oxalyl chloride (0.286 mL, 3.27 mmol). A few drops of DMF were added and the mixture stirred at room temperature for 2 h. Solvent was then removed under reduced pressure. The crude acid chloride was then diluted with dichloromethane (10 mL)) and added to a stirred solution of hydrazine (0.641 mL, 20.43 mmol) and triethylamine (2.85 mL, 20.43 mmol) in CH2Cl2 (20 mL) and the resulting solution stirred at room temperature. After 16 h the reaction mixture was poured into sat. NaHCO3 and extracted with dichloromethane (50 mL×3), dried (Na2SO4), filtered and concentrated to give a yellow oil which was used in the next step without further purification. LCMS (M+H)=504.10.

1. customSolvent was then removed under reduced pressure
2. additionThe crude acid chloride was then diluted with dichloromethane (10 mL)) and
3. stirringthe resulting solution stirred at room temperature
4. extractionextracted with dichloromethane (50 mL×3)
5. dry with materialdried (Na2SO4)
6. filtrationfiltered
7. concentrationconcentrated
8. customto give a yellow oil which
9. customwas used in the next step without further purification