Diisopropylethylamine → 4-[6-((2S)-2-Benzyloxycarbonylamino-2-tert-butoxycarbonyl-ethylamino)-purin-9-yl]-butyric acid ethyl ester

온도

80 °C

1 g (3.72 mmol) of 4-(6-chloro-purin-9-yl)-butyric acid ethyl ester was dissolved in dimethylformamide (3 ml) and 2.6 ml (14.9 mmol) of N,N-diisopropylethylamine was added. 1.09 g (3.72 mmol) of (2S)-3-amino-2-benzyloxycarbonylamino-propionic acid tert-butyl ester and dimethylformamide (2 ml) were added. The reaction was stirred at 80° C. for 2 days. The solvent was removed in vacuo, the residue was dissolved in dichloromethane and the solution was washed three times with 10% aqueous citric acid solution and three times with water. The organic phase was dried with sodium sulfate, filtered and the solvent was removed in vacuo. Residual amounts of 4-(6-chloro-purin-9-yl)-butyric acid ethyl ester were removed as follows: the residue was dissolved in tetrahydrofuran and 2 g of a macroporous aminomethyl polystyrene resin was added. The suspension was heated at 60° C. for 5 hours, then stirred gently at room temperature for 16 hours. The resin was filtered off, washed with tetrahydrofuran, and the combined organic phase was dried in vacuo. Yield: 908 mg.

1. customThe solvent was removed in vacuo
2. dissolutionthe residue was dissolved in dichloromethane
3. washthe solution was washed three times with 10% aqueous citric acid solution and three times with water
4. dry with materialThe organic phase was dried with sodium sulfate
5. filtrationfiltered
6. customthe solvent was removed in vacuo
7. customResidual amounts of 4-(6-chloro-purin-9-yl)-butyric acid ethyl ester were removed
8. dissolutionthe residue was dissolved in tetrahydrofuran
9. addition2 g of a macroporous aminomethyl polystyrene resin was added
10. temperatureThe suspension was heated at 60° C. for 5 hours
11. stirringstirred gently at room temperature for 16 hours
12. filtrationThe resin was filtered off
13. washwashed with tetrahydrofuran
14. customthe combined organic phase was dried in vacuo

ORD 기록

ord-7b468c637b0a47fc95c924a592f0b934

출처 데이터셋

uspto-grants-2007_08

DOI

10.6084/m9.figshare.5104873.v1

특허 번호

US07259159B2