Diisopropylamine → 1-(3-Cyclopentyloxy-4-methoxyphenyl)-2-(3,5-dichloropyrid-4-yl)ethanol

Beteiligte Stoffe

Reaktionsschritte

A stirred solution of diisopropylamine (9.75 mL) in dry tetrahydrofuran (200 mL) at -70° C. is treated dropwise with a solution of butyl lithium in hexane (27.2 mL; 2.5 M) and the solution is stirred for 30 minutes. It is then treated with a solution of 3,5-dichloro-4-methylpyridine (10.25 g) in dry tetrahydrofuran (60 mL) during 30 minutes, while keeping the temperature below -75° C., and the solution is then stirred for a further 30 minutes. It is then treated with 3- cyclopentyloxy-4-methoxybenzaldehyde (13.92 g) in dry tetrahydrofuran (60 mL) during 15 minutes, and stirred for a further 1 hour 30 minutes at -75° C. The solution is treated with aqueous ammonium chloride solution and extracted with ethyl acetate (3×100 mL). The organic layers are combined, washed with brine, dried and concentrated to low volume. The resulting precipitate is filtered off, to give 1-(3-cyclopentyloxy-4-methoxyphenyl)-2-(3,5-dichloropyrid-4-yl)ethanol (20.5 g), m.p. 124°-125° C.

Herkunft & Nachweise