HCID 178418260、化合物 → HCID 178470417、化合物

関与物質

反応条件

反応手順

1.57 g (4.5 mmol) of 4-Iodo-5-thiophen-2-yl-2H-pyrazole-3-carboxylic acid ethyl ester, 0.81 g (9.0 mmol) of copper cyanide and 352 mg (2.3 mmol) of tetraethylammonium cyanide were dissolved in 10 ml of DMF and 20 ml of tetrahydrofuran and the solution was degassed with argon. 223 mg (0.2 mmol) of Tris(dibenzylideneacetone)dipalladium (0) and 374 mg (0.7 mmol) of 1,1′-bis-(diphenylphosphino) ferrocene were added at RT. The reaction was stirred at 120° C. for 5 h. The solvent was removed under reduced pressure. The residue was dissolved in ethyl acetate and this solution was washed with saturated aqueous sodium bicarbonate. The organic phase was dried with sodium sulfate, filtered and the solvent was removed under reduced pressure. The product was purified by silica gel chromatography eluting with n-heptane:ethyl acetate/1:1.

情報源と証拠