Dimethylformamide → HCID 178441570、化合物

2-Butyl-3H-imidazole-4-carbaldehyde (30.0 g, 197 mmol) was dissolved in DMF (220 mL, 2.8 mol). NBS (36.8 g, 207 mmol) was added and the mixture was stirred at room temperature overnight. The mixture was then concentrated and taken up in EtOAc and water. The aqueous layer was extracted three times with EtOAc, and the combined organic extracts washed with saturated aqueous NaCl, dried over MgSO4, filtered, and concentrated. The mixture was purified by silica gel chromatography (0-50% EtOAc:hexanes) to obtain 7.8 g of the title compound as a gray solid. MS m/z: [M+H+] calcd for C8H11BrN2O, 232.09. found 233.0. 1H-NMR (DMSO): 13.3 (1H, br), 9.48 (1H, s), 2.66 (2H, t), 1.59 (2H, m), 1.25 (2H, m), 0.85 (3H, t).

1. concentrationThe mixture was then concentrated
2. extractionThe aqueous layer was extracted three times with EtOAc
3. washthe combined organic extracts washed with saturated aqueous NaCl
4. dry with materialdried over MgSO4
5. filtrationfiltered
6. concentrationconcentrated
7. customThe mixture was purified by silica gel chromatography (0-50% EtOAc:hexanes)

ORDレコード

ord-0e3c731cb3ec46db89d6b1dd82810ca8

出典データセット

uspto-grants-2012_08

DOI

10.6084/m9.figshare.5104873.v1

特許番号

US08236846B2