2-(Dimethylamino)ethanol → 3,4-dihydro-6-[2-(dimethylamino)ethoxy]-3-(1-phenylmethyl-4-piperidinyl)-2(1H)-quinazolinone

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Reaction Steps

A mixture of 1.1 g (3.26 mmol) of 3,4-dihydro-6-hydroxy-3-(1-phenylmethyl-4-piperidinyl)-2(1H)-quinazolinone, 50 mL of tetrahydrofuran, 0.30 g (3.366 mmol) of 2-dimethylaminoethanol, 0.94 g (3.584 mmol) of triphenylphosphine, and 0.56 g (3.216 mmol) of azodicarboxylic acid ester was stirred for one hour at ambient temperature, 6 hours at reflux temperature and another 13 hours at ambient temperature. The solvent was removed in vacuo and the residue was purified by column chromatography on silica gel (30-60 μm) using dichloromethane/EE/cyclohexane/methanol/concentrated ammonia 60/16/5/5/0.6 v/v/v/v/v as eluant. Working up the corresponding fractions yielded 0.9 g (69% of theoretical) of a colorless crystalline substance, Rf=0.47 (dichloromethane/EE/cyclohexane/methanol/concentrated ammonia 60/16/5/5/0.6 v/v/v/v/v).

Provenance & Evidence