Nitrogen → HCID 21694197, compound

A solution of 3-bromo-2-hydroxybenzaldehyde (20 g, 0.1 mol) in 150 mL of CH2Cl2 was added HBF4.Et2O (1.5 mL, 0.01 mmol). A solution of ethyl diazoacetate (27.36 g, 0.24 mol) in CH2Cl2 (50 mL) was introduced into the reaction mixture, during about 3-6 min and the evolution of N2 gas observed, and the reaction was not allowed to go above 38° C. Once gas evolution ceased, the reaction mixture was concentrated by rotary evaporator and H2SO4 (20 mL) was added to the mixture while stirring. After 30 min, the mixture was diluted with CH2Cl2 (200 mL) and the H2SO4 was quenched with solid NaHCO3. The mixture was then filtered through silica gel (100 g), and concentrated by rotary evaporator to give an oil, then exacted with EtOAc (500 mL), and washed with brine (100 mL), dried over Na2SO4. The solvent was concentrated in vacuo. The residue was separated and purified with silica gel chromatography to give product ethyl 7-bromo-1-benzofuran-3-carboxylate.

1. customto go above 38° C
2. concentrationthe reaction mixture was concentrated by rotary evaporator and H2SO4 (20 mL)
3. additionwas added to the mixture
4. additionthe mixture was diluted with CH2Cl2 (200 mL)
5. customthe H2SO4 was quenched with solid NaHCO3
6. filtrationThe mixture was then filtered through silica gel (100 g)
7. concentrationconcentrated by rotary evaporator
8. customto give an oil
9. washwashed with brine (100 mL)
10. dry with materialdried over Na2SO4
11. concentrationThe solvent was concentrated in vacuo
12. customThe residue was separated
13. custompurified with silica gel chromatography

ORD record

ord-27b17980268046dc9fab9650f4aec59c

Source dataset

uspto-grants-2015_06

DOI

10.6084/m9.figshare.5104873.v1

Patent number

US09056859B2