反应详情

Step-7: A solution of 4-(2-(dimethylamino)-1-(1H-imidazol-1-yl)butyl)aniline (600 mg, 2.32 mmol) and KSCN (508 mg, 5.22 mmol) in 15 mL AcOH was cooled to about 7° C. and treated with Br2 (125 μL, 2.43 mmol) in 2 mL AcOH added drop-wise via syringe over 5 min. The reaction vessel was removed from the cooling bath and stirred at rt for 1 hr. The reaction was cooled in an ice bath and basified with 3N NaOH (100 mL) added portionwise over several minutes. This mixture was then extracted with DCM (4×75 mL). The combined organic extracts were dried over Na2SO4, decanted and concentrated in vacuo. The residue was purified by silica gel column chromatography eluting with 6% MeOH (2N NH3)/DCM to give 6-(2-(dimethylamino)-1-(1H-imidazol-1-yl)butyl)benzo[d]thiazol-2-amine as a yellow foam. MS ESI: m/z 316.16 [M+1+].

1. customThe reaction vessel was removed from the cooling bath
2. temperatureThe reaction was cooled in an ice bath
3. additionadded portionwise over several minutes
4. extractionThis mixture was then extracted with DCM (4×75 mL)
5. dry with materialThe combined organic extracts were dried over Na2SO4
6. customdecanted
7. concentrationconcentrated in vacuo
8. customThe residue was purified by silica gel column chromatography
9. washeluting with 6% MeOH (2N NH3)/DCM