tert-Butyl methyl ether → (4-Bromo-5-methyl-thiophen-2-yl)-3-(3,5-dichloro-phenyl)-4,4,4-trifluoro-3-hydroxy-butan-1-one

Beteiligte Stoffe

Reaktionsschritte

LiH (3.2 g) is added to a solution of 1-(3,5-dichloro-phenyl)-2,2,2-trifluoro-ethanone (56 g) and 1-(4-bromo-5-methyl-thiophen-2-yl)-ethanone (41 g) in dry THF (500 ml). After 5 h at 60° C. under nitrogen atmosphere, tert-butylmethylether (500 ml) is added to the reaction mixture. The reaction is slowly quenched with water (500 ml) at 5° C. and further extracted twice with tert-butylmethylether (500 ml). The organic phases are combined, washed with a saturated aqueous solution of NaCl, dried over MgSO4 and concentrated in vacuo to yield 1-(4-bromo-5-methyl-thiophen-2-yl)-3-(3,5-dichloro-phenyl)-4,4,4-trifluoro-3-hydroxy-butan-1-one (110 g, 77% purity) as a brown oil. The crude product is used without further purification.

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