反应详情

温度

100 °C

Under an argon atmosphere, 1.0 g of 4-bromo-1-isobutoxy-2-nitrobenzene, 1.0 g of bispinacolatodiboron, 1.2g of potassium acetate, and 0.1 g of tetrakis(triphenylphosphine)palladium were heated at 100° C. for 4 days in toluene. Then, 658 mg of 5-bromothiophene-2-carbonitrile, 0.1 g of tetrakis(triphenylphosphine)palladium, 10 ml of 1,4-dioxane, and 12 ml of a 2 M aqueous sodium carbonate solution were added thereto, followed by heating at 100° C. for 4 hours under an argon atmosphere. After the reaction solution was diluted with water and ethyl acetate, the solution was filtrated through celite. The filtrate was extracted with ethyl acetate and the organic layer was washed with brine and then dried and concentrated under reduced pressure. The residue was purified by silica gel column chromatography (hexane:ethyl acetate=90:10) to obtain 522 mg of 5-(4-isobutoxy-3-nitrophenyl)thiophene-2-carbonitrile. Then, 214 mg of the compound, 0.13 g of triethylamine hydrochloride, and 60 mg of sodium azide were heated at 100° C. for 14 hours in 20 ml of toluene. Additionally, 0.13 g of triethylamine hydrochloride and 60 mg of sodium azide were added thereto, followed by heating at 100° C. for 4 hours. The reaction solution was extracted with water and the aqueous layer was acidified with 1 M hydrochloric acid. The precipitate was collected by filtration, washed with water, dried, and purified by silica gel column chromatography (chloroform:methanol:acetic acid=94.7:5:0.3) to obtain 67 mg of 5-[5-(4-isobutoxy-3-nitrophenyl)-2-thienyl]-1H-tetrazole.

1. filtrationthe solution was filtrated through celite
2. extractionThe filtrate was extracted with ethyl acetate
3. washthe organic layer was washed with brine
4. customdried
5. concentrationconcentrated under reduced pressure
6. customThe residue was purified by silica gel column chromatography (hexane:ethyl acetate=90:10)