反应详情

trans-Toluene-4-sulfonic acid 3-[4-(2-naphthalen-i -yl-acetylamino)-imidazol-1-yl]-cyclobutyl ester (Preparation 4, Step 3; 593 mg, 1.25 mmol) was mixed with sodium azide (813 mg, 12.5 mmol) in ethanol (15 mL), water (5 mL), and chloroform (5 mL). The mixture was then heated at reflux with stirring for 96 h. The solvent was removed in vacuo and the residue was diluted with water and was extracted with methylene chloride. The organic layer was dried (MgSO4), filtered, and was concentrated in vacuo. Purification by silica gel chromatography (50:1 chloroform-methanol) afforded 340 mg (79% yield) of N-[1-(cis-3-azido-cyclobutyl)-1H-imidazol-4-yl]-2-naphthalen-1-yl-acetamide; 1H NMR (400 MHz, CDCl3) δ8.41 (s, 1H), 7.98 (d, J=6.4 Hz, 1H), 7.87 (m, 1H), 7.82 (m, 1H), 7.5 (m, 2H), 7.45 (m, 3H), 7.08 (d, J=1.7 Hz, 1H), 4.2 (m, 3H), 3.75 (m, 1H), 2.85 (m, 2H), 2.35 (m, 2H); MS (AP/Cl): 347.2 (M+H)+.

1. temperatureThe mixture was then heated
2. temperatureat reflux
3. customThe solvent was removed in vacuo
4. additionthe residue was diluted with water
5. extractionwas extracted with methylene chloride
6. dry with materialThe organic layer was dried (MgSO4)
7. filtrationfiltered
8. concentrationwas concentrated in vacuo
9. customPurification by silica gel chromatography (50:1 chloroform-methanol)