反应详情

A mixture of 2.00 g of crude 5-bromo-2-(3,4-difluorophenyl)pyridine (GC purity 81%), 1.12 ml of 3,3-diethoxy-1-propine, 0.138 g of tetrakis(triphenylphosphine)palladium, 0.052 g of copper(I) bromide and 36 ml of triethylamine was heated to boiling for 2 hours. After cooling the reaction mixture was diluted with 100 ml of diethyl ether, washed twice with 40 ml of water each time, dried over sodium sulphate, filtered, the filtrate was boiled briefly with active charcoal, filtered and concentrated. The crude 5-(3,3-diethoxy-1-propynyl)-2-(3,4-difluorophenyl)pyridine, (2.58 g; GC purity 72%), obtained as a brown-black oil, was used directly in the next step.

1. temperaturewas heated
2. temperatureAfter cooling the reaction mixture
3. washwashed twice with 40 ml of water each time
4. dry with materialdried over sodium sulphate
5. filtrationfiltered
6. filtrationfiltered
7. concentrationconcentrated