Triethylamine → 4-Bromo-N-(prop-2-yn-1-yl)benzamide

To 4-bromobenzyl chloride (4.39 g, 20 mmol) in 40 mL dichloromethane at 0° C., propargylamine (1.10 g, 20 mmol) was added, followed by triethylamine (4.05 g, 40 mmol). The mixture was stirred at room temperature for 40 minutes. 150 mL ethyl acetate was added and filtered. The filtrate was washed with 2×40 mL water and 40 mL brine, dried and concentrated to give 4-Bromo-N-(2-propynyl) benzamide. 4-Bromo-N-(2-propynyl) benzamide was added into ice cooled 47 mL concentrated sulfuric acid. The reaction was stirred at 5°-10° C. for 3 hours and at room temperature overnight. The mixture was poured into 500 mL ice water, neutralized with sodium carbonate to pH 8 and extracted with 3×250 mL ethyl acetate. The combined organic extracts were washed with 200 mL water and 100 mL brine, dried and concentrated to afford compound A (4.5 g, 95%) as a light yellow solid.

1. filtrationfiltered
2. washThe filtrate was washed with 2×40 mL water and 40 mL brine
3. customdried
4. concentrationconcentrated

ORD-Eintrag

ord-ef2a9dd5c3ec4f8e805fb514dd735113

Quelldatensatz

uspto-grants-1998_10

DOI

10.6084/m9.figshare.5104873.v1

Patentnummer

US05827869