反应详情

A mixture of 2-amino-5-bromo-isonicotinonitrile (5.0 g, 25.3 mmol), NaHCO3 (3.6 g, 42.9 mmol) and chloracetaldehyde (17.0 mL, 114.0 mmol) in EtOH (160 mL) was vigorously stirred and refluxed for 14 h. The reaction mixture was cooled to RT, concentrated under vacuum and the remaining residue was suspended in DCM (500 mL) and brine (100 mL). The aqueous layer was separated and extracted with DCM (5×), and the combined organic fractions were dried over Na2SO4, filtered, and evaporated. The residue was purified by Combi-Flash Companion™ (Isco Inc.) column chromatography (SiO2; gradient elution, [hexane/DCM 1:1]/TBME 95:5→3:7) to yield the title compound (2.97 g, 13.4 mmol, 53%) as an orange solid. MS: 223 [M+1]+; HPLC: AtRet=0.54; TLC: RF 0.17 (hexane/DCM/TBME 1:1:2).

1. temperaturerefluxed for 14 h
2. concentrationconcentrated under vacuum
3. customThe aqueous layer was separated
4. extractionextracted with DCM (5×)
5. dry with materialthe combined organic fractions were dried over Na2SO4
6. filtrationfiltered
7. customevaporated
8. customThe residue was purified by Combi-Flash Companion™ (Isco Inc.) column chromatography (SiO2; gradient elution, [hexane/DCM 1:1]/TBME 95:5→3:7)